Malicious PDF — malware analysis report

Static analysis result for SHA-256 15fc7860e7a96f48…

MALICIOUS

PDF

98.3 KB Created: 2021-06-28 17:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 30b99b6b681effdb0a6ce04a3649289e SHA-1: e4c2f882ee268e621cdb201499b3e67298c3041b SHA-256: 15fc7860e7a96f48b2be7619bc9c798b3a539caaf4dae23a528fed80bf2e912b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm strategy for SEO poisoning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a malicious payload. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 https://laborke.ru/uplcv?utm_term=retail+management+interview+questions+and+answers PDF link annotation
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/9ca3637fb254b7de51c34fbbfe53a2c9/36046827681.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b25bd6f0064243f4a92bf3fb18047a82/63718073473.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/17709220298.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099e83568ddc---jujejuzazojugodoka.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/6345bc790c6fb408e77340f718410b46/zarojedizifezidefezil.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/38031761364.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7242c5395---74011403021.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606efd7ab6510---zorotebikam.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/kd2suivnhqt6v4k8en9kdcfum7/mogisejokolulurigi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bcnndt5sce9befprf9r45uv0j6/vabixuperozenorefiluwoji.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/tivizukuxuf.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/pigir.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/fbc85801adcab66de5a796cd414188bb/giduseraxezu.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/sorejidbv5dvtujronnhb7mkqm/85838465835.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec54f1279b---fezetixunog.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/gunopa.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/61281479239.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8536cd47a6---gutimonetumixeguximifada.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ac03009e71c---kabezokipimebuvekexa.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/ladavamimuwefujepakogiz.pdfIn PDF document text
    • http://asustainable.com/global/file/solunu.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/vejexisum.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/piverimubumorufa.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/36080807610.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bc37770e9---toxuzadazebogajuno.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/vubevizopim.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_off00011b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9D 17820 bytes
SHA-256: 2075bbe8ebfb1f6e8c558cfcdb3d4d5ad0beefc258618aac3d59db4fbab5240c
font_01_sfnt_off00014a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A67 11032 bytes
SHA-256: 24c0ad2864d25113f3cb0f3669e90dbc55e914328bb9dd71425224afb3079a10
font_02_sfnt_off0001638f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1638F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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