Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae5d660c977c5d5…

MALICIOUS

PDF

102.6 KB Created: 2021-07-31 22:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cfa5a91ac4dceb100e83a1262eeaa4b7 SHA-1: 5dc63c90d23ab8dd0761bfc3f516df72145969e9 SHA-256: 1ae5d660c977c5d5e812d3e0038b5e568bb0621a797aecddc18d90cb17a6210f
126 Risk Score

Malware Insights

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

This PDF file contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggests a phishing or trojan distribution intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3546

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c69b1decbd67b49e83176bfc77f4e7a4/sofixuxiwikevalo.pdf In PDF document text
    • https://leo.tw/upload/ckeditor/files/daxibozaziwurore.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/12054440241.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/9048490239.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/97210325868.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/7b14be20c765fccd63dded18a1a8d1f1/79747100450.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/qc076q4aoc2et5racjrsq4lpmk/94328869221.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a810c400---69948169558.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/gilonijukurinet.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff339722b50124cdfd1edf7c1af8ffa6/56218543957.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1a67273c---gariz.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/252fb2efaf57a1e0292ebaf617a2b9ef/fefezokaperugezopetolitaw.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7464b4206---98697386948.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/57104662553.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/dikulukovovokekip.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00d15eb793---24807420230.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/daxegenegulebevaguxaxoz.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/rigazamaginuborigok.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/61924193710.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb606298ab8cb1ec545f02a89145b99a/54094939044.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/94637853570.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/fev426subj6vumb53sojj5ipk5/motanis.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160afcbefc8729---99835076904.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/wezuzus.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702f40a9c91---11397401279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+spawn+a+helicopter+in+gta+v+xbox+onePDF link annotation
    • 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_off00013905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13905 18016 bytes
SHA-256: c02ec35182b37bb6a93d6b437ddf47a980d8ad62a8215603cbdc6098c6ecdb5a
font_01_sfnt_off00016874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001808b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1808B 11392 bytes
SHA-256: 0936f02a0b147e409098daaff5c1b5adf2176d5519b2d4bac51a4f038180941d

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