Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8a8d672e7d0d2a…

MALICIOUS

PDF

72.5 KB Created: 2021-09-27 18:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 00ed39a6ecf6941c48fa9f9e25dc7c35 SHA-1: 9f8e992de58b5eb1b4dd74fcbaf773de5fcc769c SHA-256: 5e8a8d672e7d0d2a93657458fe6323960f189b1470257aed9ef2cb669060e772
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm that points to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The presence of external URIs and a link farm heuristic strongly suggests a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145a81140a52---jazulovefin.pdf In PDF document text
    • https://johanbjerke.se/userfiles/file/saxipajeregimitajuvef.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/seraxav.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/35142486666.pdfIn PDF document text
    • http://chemsdano.com/upload/files/3618343001.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/vutamutovulumujatem.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/94435112174.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/24831893127.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/lowewobefimi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1e7bf06fc5b951ca4ed90c030504001b/soseganifexarobobirutaru.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/ripaxazugabugupafed.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/86900905806.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/guperidamusov.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/80916471518.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/44364315962.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/65685310159.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/73519300369.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/wogowegosepuzi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fadf504bd0---muwomuzobikaxa.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/93188377730.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/wuzadokajupefilotop.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/pekedosabijopuxudejasu.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/rusigagun.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/10791464968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=solve+for+y+with+fractionsPDF 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_off0000b79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79C 17096 bytes
SHA-256: 0fa49ae4b2d7288fe5343ee8fe7f530a35a3a9af2fe4d4c6949259ec6fd7edf0
font_01_sfnt_off0000e378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 10776 bytes
SHA-256: 6000f2827d23ccb1e706d0386c2cb96ff17b4d6fad8b5e2db8266c4c5255d0d3
font_02_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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