Malicious PDF — malware analysis report

Static analysis result for SHA-256 e285cc91fef5122f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 02:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab372f91380384a94ea7cac5040be1f1 SHA-1: 17b96ec2361aa8e9b1ac9e601dd579bd922865c8 SHA-256: e285cc91fef5122fafa604c42c76cf80f99eadf1325fc8ecfb095ccb76dac81b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF being a link farm, directing users to compromised websites and potentially disposable hosting. The presence of embedded URLs suggests an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=kenwood+car+audio+bluetooth+manual PDF link annotation
    • https://ewdel.cz/ckfinder/userfiles/files/rofaloxonopepivubidivaj.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609654ca29314---95857990025.pdfIn PDF document text
    • http://netflor.pl/upload/File/wupabisenivig.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a83329d775---44806615672.pdfIn PDF document text
    • https://cakkue.com/contents//files/8136396535.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/43765401957.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/butudinetojorov.pdfIn PDF document text
    • http://schokozentrale.de/idata/lubazesadaxupuwug.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/et45jhtqc63vera6qq9givnvh2/92277877449.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1efe36b18---6853602385.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/56535017683.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/96876997233.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/tewivovuru.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/41059276589.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160890f8e623a4---40712960993.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/satojuke.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/e5a679e962981030d44ef0d9cef84717/37525956254.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/jivepewuladu.pdfIn PDF document text
    • https://ikima.fr/uploads/file/molavalodaxeki.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/0208d202148e2ba83bd69b94e1ea9329.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/gepurodimugapot.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630201769120599959.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160de9ca95183b---8413286829.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/zozadawerovuloduvevokire.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_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 18176 bytes
SHA-256: a40fb8f259102d0facce78fcd4ac2bdc83576b658844182bcf8724c26694e8d0
font_02_sfnt_off00012815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12815 10784 bytes
SHA-256: 29a48508dbaebae673ef1a9834c2b0a30568fb374a2010768723942fc7b7c1e2