Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a82e4b7d759c74…

MALICIOUS

PDF

69.1 KB Created: 2021-06-18 07:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a86cc45128ffd47910b5804951677c16 SHA-1: 6a77d94fe4409a27d5e43c991dc56989cf2cbb6c SHA-256: 14a82e4b7d759c7437268e58c6c9efff78d7683161a2b9e02fc9d63bf192ef61
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://philabc.ru/uplcv?utm_term=regular+nct+mp3+download PDF link annotation
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092bf36836e9---71926922910.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/26091094491.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab1e4e4f1---lodomabulinevumajune.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/86176149841.pdfIn PDF document text
    • http://debden.org/userfiles/file/jelepukunalasebudubikib.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/vusulimurojejiwazuzijiw.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/56820808735.pdfIn PDF document text
    • http://springbook.no/files/73931757117.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e94289a74b---wizojoto.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0163e30e0725a728de0298322dc35344/94810990908.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021051304512470554.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/qg3b2j0jufitg41cnjkl670tk9/fijazitozesakusadejufe.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/89369572506.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b8f4415d1---23449245386.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/fd1c95cf866f02505bf662468b760228/28040478927.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/35292201117.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ae701ae06---35772449973.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01cbaddc5b---92730426842.pdfIn PDF document text
    • https://ski-experience-japan.com/images/blog//file/4692745440.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b0353ea85---xunivalumakubusakerepilut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0C 5540 bytes
SHA-256: adf620c59828b2bd5e69c9460bd38d67fcdd9820005f173c50600f611fac5b60
font_01_sfnt_off0000cf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF06 5480 bytes
SHA-256: 02383f3180e67deae0f884e7f7ab79f26ffbca8c1c250b4202e02da76273bdc4
font_02_sfnt_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 11044 bytes
SHA-256: 05b8b8513e0cd3d823031e2a17df739e38227c9035c1448fe0914731aca1605a