Malicious PDF — malware analysis report

Static analysis result for SHA-256 28402230d712ae78…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 05:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a93f912a9faaa2047763645d92c2fde SHA-1: 0186a4aa09d1affe754be9b6a506c8bdb36639c0 SHA-256: 28402230d712ae78a224f095e53918f473fbe89563cc45543c83f9bbdc48c220
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' in some URLs further supports a campaign-like distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://allytemp.ru/uplcv?utm_term=after+we+fell+novel+download PDF link annotation
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417335cb8bb---29420242299.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/josafagipipewore.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161409c8ca4ca7---lorijuzoxodanu.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/daremepipenijolufila.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/8964161672.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/78411315946.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/mimiwelen.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/30597799361.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/dedakivixufovu.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/35477571958.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/lajofutegekajifaf.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/femozeg.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/92214818247.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/if542vhj8ur628bcgkrcjnrjc2/vumofezuxumewib.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/5854kdj35997s04c5jgnu1qh3k/94917933671.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/48770664835.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/51831851385.pdfIn PDF document text
    • https://synersys.fr/contenu/file/sefusibax.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/mosuweruvaguli.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/keruminoriwepeto.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-07/535d0d7b43ff143ab44689ffd026559e.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/65377157087.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/vedodimirukafokugut.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/12131848020.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/0d7018d5f5de6f3e20c68553d1398df6/17032698581.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_off0000ce27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE27 19136 bytes
SHA-256: a658f7f12b5bfc6d02ce13922245c955a4785e40c4be35b5d3d01721f8be532d
font_01_sfnt_off000100a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BD 10220 bytes
SHA-256: 9ed96324c974824f0f62d5c6803051dd15228e8a147621e44cdfbaf56f472654