Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7954bb096d6f0c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 12:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5feacd0fe009f1563ba5a2530f861812 SHA-1: 5b626d35dc2303264201da3326ade128de9a13b1 SHA-256: 4b7954bb096d6f0cd0dce9e1f5e81dae5fa933cba2df621e8f2f0a69c1bb141b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate maliciousness, consistent with phishing or malware distribution tactics. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c8d77b886ce1cdd5524b288ffb60460b/72180539917.pdf In PDF document text
    • http://jakpaisanestate.com/images/upload/files/wizam.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2d74dd9f5870cb100ca63479ab1a2da7/55800774486.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/efcd09cfe00696ac56807315566c894a/sixotuge.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/eda8398fcd0b372b424653def0e424d7/pukisexapatureru.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ejp9j41ffm7n4j3g5737vla5cu/wekuxuzaginikutipipiz.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/wuzanakupagibarutokoki.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/bf4273d681ada03e2443755bc7ecb292/95153074645.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/zujisemujomube.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/katutelag.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160708b113481a---26676262906.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/31541886986.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/gibewofukanajexubas.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/kozosirozidirasosalu.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/jenifixuxavabanu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609886f63bd02---fosokiduda.pdfIn PDF document text
    • http://ttc-investco.com/img/files/65451777609.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/vobadadeneji.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/slalktkqfoccphuh8gcsfnmgh4/gugen.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8cf9cb92f---86032166901.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/73752675171.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/disakuberiduzimuromidofa.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/zanejejetasubate.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16092c1938a820---41392259044.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608112be5b4bc---fatus.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/7aa4e25a2c96a8da024adc50c9b2b4db/tujiziwudetaxebowugoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=eigrp+manual+summarization+commandPDF 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_off0000d08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08A 10868 bytes
SHA-256: 0cb131bb014042bc77bb1ef96a80896cac4dd02574ba315fd0ca8927c44828cc
font_01_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 16768 bytes
SHA-256: 701966bc846c83dc9a8110e0b076a4d2544c043bc5e6da2f362a0baf4dfc0a6e
font_02_sfnt_off000114aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1