Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b0609b78dcf3f4…

MALICIOUS

PDF

108.6 KB Created: 2021-06-29 01:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d929522d5a5e05c3e3c7f5d5396ad9f4 SHA-1: 8d1837db69b77572f44caba88e75ec8ec63fcd1a SHA-256: 93b0609b78dcf3f472c968df2d68dab080fc1f7141bcf3a34adeb1a9111ca2bc
164 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, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://nomylo.ru/uplcv?utm_term=12th+chemistry+one+mark+questions+pdf PDF link annotation
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5mrn3e0ts1i2u7282ibtao6bvp/44223240599.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/lck5gj0q1uc2igloaebu7l5mrj/51288028415.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/cn8bg5fnk3s2fapcb2h37aj693/xabukubu.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/10098889153.pdfIn PDF document text
    • https://magerp.org/upload/files/60177021748.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lan7lrrjbhd10nlolmbha97800/70076461703.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6acfe992f0750f035dd332fa49501fe7/jaxonowewomop.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/ligovaziwinijamipijexud.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/39515905150.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/4g4cg45mf1kr86akjnbugdmk96/85898364317.pdfIn PDF document text
    • https://iword.de/userfiles/file/kopupafemo.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f30f35639136842b1224327d67d98e72/40491797755.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/21852447558.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a5c229889---bibudurevowagesa.pdfIn PDF document text
    • http://tfforming.ru/d/files/85256449184.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/42042484289.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fc449d175---75652700786.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/merilasa.pdfIn PDF document text
    • http://vangphugia.com/userfiles/file/53634898033.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/699bf05d7ce2797b625b165b04f0453f/32371361016.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8B 11368 bytes
SHA-256: 70262cb9b445670479c383ece3f038300395556d0193bb28fcb687df7438b03c
font_02_sfnt_off00017808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17808 17332 bytes
SHA-256: 6f8af73e5108616d1e00e1d9655416f289e0a2457f4d162bde8fa0d4c65f634d

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