Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdbb9aea44867e8…

MALICIOUS

PDF

108.6 KB Created: 2021-06-26 23:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1962240e9c45a6f0707811b67d6e950b SHA-1: 808198f95e36f95ed284e68f621fd9b8d43a47c0 SHA-256: dfdbb9aea44867e8bd9af5a3c6692755a055175eaa636cf161b684ccc695c597
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of external links and the PDF structure itself are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://inwebjor.ru/uplcv?utm_term=dc+universe+online+powers+and+weapons+guide
    • http://am-assets.com/aom/magnolia/userfiles/file/99186832682.pdf
    • https://anukulagrotech.com/userfiles/file/84530334263.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160799dfcbd38e---50016354995.pdf
    • http://ithalattagarantibelgesi.com/resimlerfiles/95855882976.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ebhtltiuh9plk26jlej9vqbuuq/98426106836.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d60fbafbe959a79f954c7945c74d33e4/36951210194.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b9b4f1aef---digogotesogip.pdf
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/70355185735.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ea786468db62b59a2a6f8d825c6e960b/58653720947.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f94ec501aed3554dfbcd73c6eb5240dd/kobow.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afb91cbaf51---rosuzutonulanifi.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b227302e393---jelutuxunudogonekufel.pdf
    • http://prosaison.fr/userfiles/files/71228308173.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/l88r19s58f4o0agmi7to3sp4pm/69873803566.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e5150d3cc9f58df363ec2739409a785a/80557962582.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/0c361578f07c9ea4504fa52c5013a11f/vuderatu.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6a3d03a88---36849853459.pdf
    • http://secohthailand.com/file_media/file_image/file/92440305510.pdf
    • http://www.deep2001.com/images/library/File/7931928591.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c104f623e69---66710390133.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/0rstidte6aurdqkpfgu6rs4ef0/43916724750.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072f87f2fce0---52067777951.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_off000144ab.bin
a0da779802047ddfe9a34280b14e9d0e79440bec9de946258cce8daee152a61f
pdf-font-stream PDF embedded font (sfnt) at offset 0x144AB 10844 bytes
font_01_sfnt_off00015daf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DAF 16792 bytes
font_02_sfnt_off000175c1.bin
acf0c8d4f7f69854c2e15d59822fd72d47f3a4ad98bd2e6fe6c311be2941df3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x175C1 17996 bytes