Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5cbec52b02de88…

MALICIOUS

PDF

89.1 KB Created: 2021-07-30 12:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7a99f29bfbef8f547c1f9b967d0edf20 SHA-1: d32a49c3260fe7f67bdbf893b833168da35ba590 SHA-256: 7a5cbec52b02de88ab01d53f7750369d127b4b1e99dd8ad6c072d808c1efe7fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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 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.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160894301f1203---loxubugudupisi.pdf In PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/mba6ru7948camo96iao287ni45/fijudarapeve.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa2c3aa9bb---javexexovitesaxujixasor.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/594375242.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b991c3c2d87---94881062813.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/vododolasunesilek.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/bawewurivovelelubol.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/dinuzezomojoloz.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/86683894804.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/21fd59b0772c37b3a85d05c00f06e5d7/pegoleminenatawerilusiji.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/46q9ig8v9jm8r1i0jvom4pa62q/zunofivofux.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ff7f26d313fa0047988cb67068d2e5df/vabinofikojewudisaku.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/68936819842.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/fenafifodedisugiw.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/gakevugebetozapa.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/zepapipukorajinovorovofo.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/majivunagujababufigupum.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/revolunukimazubopov.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b86a09d0840---rijadesal.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/tedoguza.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/tupejal.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/hisr204utt0gh33t4ukovqfk1q/fufeweximotedopade.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/25507175758.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/tebolem.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/45904533789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+use+zoosk+for+freePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C6 17892 bytes
SHA-256: e626e5fd6da5a0b96685fc26bbacbe74987b812c4393a1a799dd8159d20ff8e7
font_01_sfnt_off00012680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12680 10132 bytes
SHA-256: 81fe7765a0724c09c53c5c7267bebc6818ddfa7c3ef54cbcccd0298939390bd2
font_02_sfnt_off00013d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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