Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afbcbce0617b321…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 16:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa1e2dc29b36d8573d59029119b42968 SHA-1: 437900203e11544c63102e1f8c49881acdea9b7d SHA-256: 7afbcbce0617b3213b344efc6dab29eda3909e0fd0b2515bdde0d723942c4cf4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/cb07e258961317676a78d8850db3b09b/nefafotefifo.pdf In PDF document text
    • http://www.ecostroyservis.ru/File/porusakapefipugumuwitase.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/32324291386.pdfIn PDF document text
    • http://istanajpdua.com/contents//files/mojukipa.pdfIn PDF document text
    • http://seto.cz/uploads/lerataje.pdfIn PDF document text
    • http://wfhs64coyotes.com/clients/b/bb/bbaa54d3a7800b2058c5658261a6771d/File/15344483150.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/vetalinefuzesixedizeb.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/97141454031.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/c461jarauh5lafkiuiivoiq670/worezadekesagepabekadetu.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/tuwofalilevipe.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/9807390670.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/suvipofavabakokiroxogesuw.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/14161725996.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/93869940290.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/33411553437.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/jevasedonoxopenekuriji.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160841e0f1d434---19159246966.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/borusenojirej.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1rhuqscsvpg2b1s4unhevtg3o7/94892279861.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/567839e08bda6ea8844523b0a2e26947/pidixulavojuxunagizav.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/421bb9fa0f7e521f31abb4353aa0dc8d/69294281462.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/vewewawukusifav.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202108241903334169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gpsmap+276cx+user+manualPDF 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_off0000e836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 10804 bytes
SHA-256: 9a219f2e5b11a9154a19e237ebf38e5556d1bf111e3d6e8e288780a6aa165149
font_02_sfnt_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 18204 bytes
SHA-256: d5ffb07514f9dbf59030893ea9230ff79aaa5d31b053e49596b2c77ae2ae0502

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