Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd1534543b64ebf…

MALICIOUS

PDF

78.3 KB Created: 2021-06-20 11:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: aa6aa244eaab4b040e245f0268b51a88 SHA-1: 28ac8b94535f616b64a6a3837ca16f312b7e9128 SHA-256: 5cd1534543b64ebfa0933372daa5e79a0e3befc213442fbb672c07a500ea6d79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is classified as malicious, likely a phishing lure disguised as game cheats. It contains numerous links pointing to compromised websites and disposable hosting, aiming to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lead users to a secondary malicious resource, potentially for exploit delivery or further phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=cheat+animal+crossing+new+leaf PDF link annotation
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/791817bdfd6ea622b12579222433dbca/rikiguvejo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8140a84bb5---nefar.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f78c42f0ef8c432f075c2697007ba042/xatikijukagufonalitokos.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/96353638083.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d199047fec---mowomuzakafunone.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95c548bed---9483492769.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/bewob.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e9b168f46---tifixikijileba.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/637b1256e1248335d1388612fdf36111/fewepibujupugakapulapite.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/utdv6bnk2hhnqnmonqbmb6ivv0/21171485725.pdfIn PDF document text
    • http://18554080.com/userfiles/file/rakoxirib.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/31735412821.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/xawojuwalavodova.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/079fc9b135b8bdd5c2fa88df348d8c3e/91921643494.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090d3445b161---pewafamoxomidu.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b29c9d94465---36519774377.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/xatusopok.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/b5c47102cc889cc1e3b35c9f396a790e/bikuvijaxijal.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 5292 bytes
SHA-256: a34d4f8aeb285a778cb4c70ccd95f52b749b597e8343c3e188b582a4e58e7b37
font_01_sfnt_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 10452 bytes
SHA-256: 36e3c1d3b829fb657990e6a9311d4621a15e15d6ab6ab49ad1ea070506aa9ec8