Malicious PDF — malware analysis report

Static analysis result for SHA-256 264e8be8782454af…

MALICIOUS

PDF

88.4 KB Created: 2021-08-12 13:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d867a717164ce4b49952379112d26263 SHA-1: e3ac73e5bd2ce541b6f028ff65cb6a6b0c413185 SHA-256: 264e8be8782454afc4f860583f95ca03aa5419ba4d70f4783b51818deff220b3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations. These URLs are likely intended to lure users into clicking them, potentially leading to further malicious content or exploits. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087ca68e7023---20536843924.pdf In PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd92931bef---438572793.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160727fc3ca612---zabaregu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/2084973615.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7d319c592---zoxererujejotowit.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/18958201383.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc3c07ebe1---refovutobifolivawek.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843df17e57f---7598853956.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ea8f03217f3d69b8b075af23d27c66ab/fitoruzude.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/0a78197a3eda3ce932328879cf140347/40623727755.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/futumezib.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/58241ca0b9823b1c6d5040a270440c30/10416156886.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/37033277110.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/91448563491.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/tk7836o1ur3i7l2a06v23eubg3/49615264193.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0bd9e61f---45380359655.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/aorvr64fuau2mdbohug3l29dq5/tutuxubazexo.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/karimepejoxozadidivafugig.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/0626ee29ebe13f8669ca42ea7051a602/futasajoguvamikufifo.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/96272085030.pdfIn PDF document text
    • https://masihpt1.com/contents//files/posabelalexedowuzijimi.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/1d800b76e61210f26700744c8492fee6/80259159951.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/xepezoxivanaw.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/vasunujavuvomexud.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/lopidovakozexopun.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161014026cbca2---dozapenuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=la+siesta+del+martes+summaryPDF link annotation
    • 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_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 16672 bytes
SHA-256: cba09e65c60ad1192f9d26dadccb7795f8a5ada2022586aa0cdac86461026348
font_01_sfnt_off000122ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EC 10356 bytes
SHA-256: 2727f6f3782aff7207f5bb68c176ec4675c25cc856e795e93bd2f8a17f95dc82
font_02_sfnt_off00013a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1