Malicious PDF — malware analysis report

Static analysis result for SHA-256 901a40bc80f3f127…

MALICIOUS

PDF

101.3 KB Created: 2021-07-08 21:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14d532995fc8334dbd0c599a9b3eddce SHA-1: 3f81f24ab6e63fa8f61b483ddc6a5ad07e85bcd2 SHA-256: 901a40bc80f3f127e71b715d04957b0cea42e304dc01700fdd03c2b1518a426b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://oniceh.ru/uplcv?utm_term=simon+iscariot+in+the+bible
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3827690ee---doveku.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/srl506qmavqg5h9rfvta201i8v/rivapipadilugar.pdf
    • http://banhangcongnghe.com/upload/FCK/file/45949742615.pdf
    • http://chongros.com/userData/board/file/4038593608.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085af5cc9c02---64984874596.pdf
    • http://manixcnc.com/ckupload/files/nobuviguzewexuzomodewe.pdf
    • http://onnetsolution.in/userfiles/file/33670833208.pdf
    • https://bevelec.com/bevelec/dossierMois/file/64420869826.pdf
    • http://otoozevran.com/resimler/files/34436590978.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab384f2a6da---69163832126.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/327bcc7141392f2db7588fa97dd5beb0/83700950239.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ff084862a---fexovixipijoku.pdf
    • http://www.findvoters.com/userfiles/file/delajubabagolabulivopur.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0af2320a3a---zuwajugijokifogekuw.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a8e847f5c90b159eb28c50670ef58f7e/pobapopedalem.pdf
    • https://footballsod.com/images/ck-uploads/files/82480400875.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d081de41f6---kilebazezolejane.pdf
    • https://livre-art.com/ckfinder/userfiles/files/jatitulujudivotoruwufa.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/996a4755b38affd216f254732ff75184/gafozijofatadigeruxoza.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/8068dace78a32ea5a3d6607bdf72aae9/9405508798.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05c318197f---puvedotudivabanugunug.pdf
    • http://dfh-consulting.com/userfiles/file/tetelom.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99151a1e85---12644017277.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012310.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 16792 bytes
font_01_sfnt_off00013b22.bin
f95e70d4e7f34fa974886773e089251194267e287ce7cebed7f10d49e468e18d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B22 19548 bytes
font_02_sfnt_off00016e32.bin
9bb2e0391b2fcd6be7cbe52cb5df4e0d8f68f5fd795e82d71d567b34e6ff98f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E32 10712 bytes