Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7db025a0bbbe84…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 06:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b57b2340e9ef51fec70c8b36fe88fa65 SHA-1: 50af905f0f7ec56d2c21721604714b7e3fd9d6ef SHA-256: ee7db025a0bbbe84048d515ce7fcfdfc6d008a3bfff5ec69cf1edd9a017047ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://allytemp.ru/uplcv?utm_term=how+to+copy+from+clipboard+on+android PDF link annotation
    • http://alrabbancapital.com/file/files/18551257101.pdfIn PDF document text
    • https://protum.se/file/97245973589.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/18575798483.pdfIn PDF document text
    • http://potya.com/66628537334.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/lidogisoxeroladap.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/lidokasix.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/34906959358.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b2cfd4a3b---muduwivanozililoze.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/totarana.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/kiwubajojezujoliwezewokeb.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3477a876b---66853683042.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/fezusok.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/f7f8335056faf97094c73bf056331f6c/wikapepeb.pdfIn PDF document text
    • http://tid.vn/upload/files/85795061232.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/h4olc9hl0j60rtnc2o3ikjt6b4/moxokadiboraroxejeno.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/98262207788.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/sajetatagavopa.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61068468195.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/vozusurus.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/77699045249.pdfIn PDF document text
    • http://abnicum.com/files/file/59870504829.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/ropopove.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/6621981526.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/tisofusabukugimelegalo.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/midovurolawixovakuzevuf.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/462cdf6de664dd0cef26afbaae922063/masigivobalexidunonip.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_off0000daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 10812 bytes
SHA-256: 09dfc956355d397fc7d6783a3ca3074ff8b6dbb48566be9d5ce25415196175a4
font_01_sfnt_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 18636 bytes
SHA-256: aaad7a7174e8667e15e81169dcc0a9a4dc8e4bbcb37d55839dc557a2e4085e59
font_02_sfnt_off00012381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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