Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0279d3630495408…

MALICIOUS

PDF

96.1 KB Created: 2021-09-06 04:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95245ff3b2878f22fff2d88e03d421ae SHA-1: 0fb481873f5987e422c6924224551e608cf7d644 SHA-256: a0279d36304954081947e7621b3b7b6e95903a0ee3bae17e23159010cd27605d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious link farm. It contains numerous external URIs pointing to compromised websites, likely intended to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic firings strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://philabc.ru/uplcv?utm_term=information+communication+technology+pdf PDF link annotation
    • http://fujavietnam.com/images/Download/nusofoboduxunovekakinivot.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/057e392e9008f7b91d94821c82f676c6/dorirusisubesutexavatatog.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/53936777676.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cbhs835nh5u30nijrmh0oj18u5/28887482713.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/figuxolufokus.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4df088ec4a---40718834629.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e8fb4b38b---kutojupanim.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f02253befcb45f1329b281e86f6002b8/boxomugejorefivinit.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/jiwuwexawekaxuge.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/xesetemufomasujimire.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/gamojulimamekunija.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/a98b97c485305a455df3e2622e7e5451/85832415077.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/kiribinakitenezajorima.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c002b987a5e---lavepaluketojiguvut.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/72177370604.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/545e2d22de9f717ba34ec67ba460b12b/rusidedobozopasorar.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ba2b0479---berorepenavelotodemurivab.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff7c06be7---gomifixomutoxalosexi.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/97435902144.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/29e477b973a3be284efb5d572c4c0e21/vazenigisagufezibojile.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_off000111c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 18036 bytes
SHA-256: 33ea9a4a32933c61b036a28cee9061b7ff1f852f3c8ed0eabf7e621152cae0ed
font_01_sfnt_off00014132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15949 11064 bytes
SHA-256: 3be42f6a94b09c3e239ad628eaf3a980cdd9eec3a7a84f056e25bced687ca8ac

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