Malicious PDF — malware analysis report

Static analysis result for SHA-256 c623e605632e496c…

MALICIOUS

PDF

84.0 KB Created: 2021-06-10 10:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8faedbf711452b6fd82f0c8bbfa8b3a SHA-1: 50bd2bd424108ec504fc06aadcc52e4e92c7f188 SHA-256: c623e605632e496c284fff3bbc783e893fe19cf2e7ec2ab7ad1061137a0d6af6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to distribute malware. The presence of a URL with 'minecraft+full+edition+apk' in the utm_term parameter strongly indicates a phishing lure for a fake application download. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious phishing documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://synerhu.ru/uplcv?utm_term=minecraft+full+edition+apk
    • http://accessprecision.com/userfiles/file/xezilujudosusixizuf.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/huo61m2dfi1gbct69er70a5tt3/17885508079.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734aa85c6e4---31278680131.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/44gpln119bk1502dvncbmm43vp/xasidu.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc28007b6---63932411932.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/tbr6g8q1ssct4oosjn0041dcv5/46211922146.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4cd200015---1041949793.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aaa937484704580d3b10562ae6d5eefa/47042231084.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608102cf6d5a2---23953681106.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/62d8b082d3ea4572e0c25682ceafd34c/xubaxekiwedo.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095288cbe04b---kotifozixosijiko.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/2qj2mvboo0tjqs0v8k7gpdbqk2/86271757903.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aabb4114b3---38101383348.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1527b6580ac7a77321dda40be7e6e77f/sazidokitekelepujekedumad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffc0.bin
b1461802c197dde122a8a489513768eb2e8a12183f31ad3d352b4c68d95dd8ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 4920 bytes
font_01_sfnt_off00011085.bin
905f6503d99594ed4c8566e9c442544a96b51c0b2e65514aea33e67d17ce3555
pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 10304 bytes
font_02_sfnt_off000133c6.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x133C6 4324 bytes