Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83f52d1cd66c7b3…

MALICIOUS

PDF

83.7 KB Created: 2021-06-30 19:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dfefe0a9ce134f785308604eaab0bfb3 SHA-1: 56325222668964d41aac316b91d48cfeb7bd00de SHA-256: d83f52d1cd66c7b3c9063cdfc7517d344c4dde6827c703674ec94d74d8128797
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which host further PDFs. This structure suggests a link farm designed to direct users to potentially malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/7phdmp3s6e8ubi0d189mv744s6/sitazuvi.pdf In PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/45ffd8e1e7f2f070ba6c62021df9d961/56296639977.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/gisijububipivikowolasolu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b79920e54---zozimekenaduxoweza.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3fd5fa255c2426871fbd7070b1229b06/wopelilirozuruda.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/ronoloforogoseveru.pdfIn PDF document text
    • http://dzbnf.com/upload/file///82099668090.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/lerisepopotuveligowe.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5b53644a46e30ae19e5fe97a8626f819/xemuzisitofep.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d64e93b6d3a---zoxomeromisesutosupuluxo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e172aae0a3---tasemivekibunimenenuvaba.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608361c6e6ac1---12942615815.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608deca2a456b---37940804675.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/tovanavuw.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/5tmf76ue9oinmb4mtc0lhqjrk8/gomovejutupo.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/uboqbhilrga907q4t3vq4jpou2/rupulopulekeranofivitoji.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/mikisunu.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/f11118b2c5f57b826b6ecac2fbf09de3/31338686772.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9f9da3a57---59611979221.pdfIn PDF document text
    • https://clubon.top/uploads/files/kijexu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b902c5ecb---gopelenolijozokiwirulivuw.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/d7qn6h9h1iqiuea89tcee09fv3/21979925237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=droid4x+emulator+for+windows+10PDF 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_off0000e461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE461 16748 bytes
SHA-256: 10dc45a1306ef4f33b20f605c4652347647ba33c1876d99855682d996895abc0
font_01_sfnt_off00010fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C3 11056 bytes
SHA-256: 61e32718abe61f2284c44afeb9526610bc37b5bc27e316d547ce63ef0a2b2e6d

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