Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f4dd0989ab957e…

MALICIOUS

PDF

85.0 KB Created: 2021-07-03 14:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b2abe6a2af148bbaa901fa27763adb57 SHA-1: cda05e35c3c7a2ce8570e2f105866dabbfe49d62 SHA-256: 78f4dd0989ab957ecadb6709a8eea2015c71f548e91e02dfce6c463a006ad98a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the high number of suspicious URLs points to a link farm or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070238b5d8fe---46777809603.pdf In PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3bc908eb6cc4f96026ebb3b49cdbe6c9/46510322261.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b08de3c583---nuzefisafexet.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/fawatobakax.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/e46633debd8b83f4e51f5fdc8c631bf5/63579396586.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/kakutebiratovuxeguxogil.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2c1e28e94371164b321d37f61d1ae269/40228655582.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088084ecd45f---noxileto.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/blejen1t31p9nkmqbc3p7bu0e9/kexewujojefake.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vvnhm139bhraddqn9ph87nsdc0/wotamituvejarutizidari.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/75382094579.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84c5b172a---vezawuledadoj.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/91253141282.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/gujanarosogafixefenutudo.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/470032cbd23e39196cdab1791483023b/26237775931.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/71648831758.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95499dd7e6---8697514674.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082df52b0507---xuvakijilapironesudazan.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f912e493---20774206930.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/peginixepegeginuzafaxor.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/13973116565.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b23de3f87---sunide.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9463062130cdd2d209b0fce140b0edb1/90867294093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=200+pounds+beauty+full+movie+with+english+subtitlesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD95 15856 bytes
SHA-256: f4259b40292c62481fa38492b5f80e4014526dcbdcb06137935e6e7f9a77ae2b
font_01_sfnt_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 11496 bytes
SHA-256: aebd4724054ee121e699812eb4a188f7c3533d0f6d9a45f6de5884e83788a845
font_02_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 18776 bytes
SHA-256: 3ded9aaca2ef9e6c6e95cee9882111b9cda0db582afcb602817e0619031ab472
font_03_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 3572 bytes
SHA-256: e15d544c30d23dd3649f565b9e3bdcb54ce211e6b07279504bd8f364feb70be9
font_04_sfnt_off00012cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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