Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e95cf0547be4deb…

MALICIOUS

PDF

72.8 KB Created: 2021-09-01 06:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f8d8bfffe7f2c2b57160554f29b53d7d SHA-1: c59615855ea6f87b1fd1d4049759a72e3198f6ca SHA-256: 6e95cf0547be4debdcec967b86fdeb5722a6da95134fa8d8eb10cd231469c66a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution PDF. It contains numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using generated or low-reputation domains for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2815a82bf---7309769807.pdf In PDF document text
    • https://afayl.com/userfiles/file/44334625287.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/xoratefofojijudogekaxe.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/jazafazirivafipifalejop.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/vojeninakukilijunekofu.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/sulaxibesegukimibuko.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/72826276795.pdfIn PDF document text
    • http://tecumseh1962.com/clients/85183/File/tagifozadedusegeg.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/39388975850.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/k91ao3m3ljalvbcmij3ff39720/61603257427.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f00b16ae47265d0ea58e0ce4b4b1d3a6/67746558914.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/38138064768.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/wipujodu.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/xipojefefamapuj.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e9e5645ca---36080083275.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/85228746701.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/25d552ce8e4347683725ade207ef4689/58689994521.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5440045cc79adf7fb880347fd636f1d6/2115482384.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/lemagilewolasezif.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/15ba3f994b1a70281bd3e7c12d1ddf20/mijigekoror.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/fokafiladiwomoferagix.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/4602625031.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/nelinilavesawi.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/476qi2f3ahsa6ob4nch6ab6knr/61592725852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=continuous+random+variable+probability+density+functionPDF 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_off0000b980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB980 15868 bytes
SHA-256: 4f7b8eeae3f9186c8c933576d5db47dcd2006a00a7884e7303a515e101996d85
font_01_sfnt_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 11232 bytes
SHA-256: 789d1c73dfd7cfd7c9163610c7d9d65784b9a6a20a27a22fd5ef92a8f8c88d05
font_02_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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