Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83aece9ec51a9ac…

MALICIOUS

PDF

91.0 KB Created: 2021-08-15 23:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 307fe1ba0e0b7992a00e3732d6195899 SHA-1: dcb8a05fbf835c366a5cf2f82d712a24fd0948d0 SHA-256: b83aece9ec51a9ac9db3b943ba78b37aa5b71f0dadcfe41a9eb08cfa2e053167
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608014ea87123---wokudoduzutonizore.pdf In PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ead3ca55---zarizumivivet.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210528163827.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e08fdcc2dd---wojemodudejezoguborerus.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/miralobatedefowoxafu.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/2405654039.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/fozogineganixajapifaruxu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071db639b3cf---91132729593.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/gulilizuravox.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/gawexovexumuviwukipaduj.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/xunelumumumasuxixezadaved.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/wugov.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/95796030899.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd424e32c4---xenorafabelavi.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/11267456648.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/28272289110.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/pajebaboxafizuvodak.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/58573802330.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/71290675177.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/resibefuvedilupakejejazi.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ae768e7d5---64010313073.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/xowuvukexabek.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/65318428883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=can+you+get+viruses+from+roblox+studioPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/348cdcc5736364a198835bc673509f02/jewupobevenadi.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11371 11248 bytes
SHA-256: 777e2b582f78c45b5293a688d0f26327ebf31339e330aedebca938c6757f1605
font_03_sfnt_off00012dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAE 17996 bytes
SHA-256: e45c2ec39558cab7d6274701e18db07a62d2d858da2963d6977f6df6b53034ba

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