Malicious PDF — malware analysis report

Static analysis result for SHA-256 3787d46b491cd125…

MALICIOUS

PDF

76.0 KB Created: 2021-09-15 13:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aac641742f18b7c4456cc52827ae7a16 SHA-1: 44e39fd9f8cba4b287ce5efe1131976e3571f9d2 SHA-256: 3787d46b491cd1257fe2018adc1a2995cb65ac57f3b5b2509e55d81759a9a6ce
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to numerous disposable hosting domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the presence of numerous unknown URLs strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://makeyourpartnermelt.com/userfiles/file/23126085845.pdf In PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd9913271---gufivonabazutomu.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/98967452069.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/vinun.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/monazurofovifizupituxuza.pdfIn PDF document text
    • http://eko-uklid.com/files/file/41477613119.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/32555611653.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/14583574961.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614038b52bd65---80181420628.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/15284578889.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109012359219748.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/62632026676.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/50958028034.pdfIn PDF document text
    • https://petala.gr/userfiles/file/wabitawiranikunexepomoris.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363e1d67bd6---38620180957.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/41808528597.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614173a7359e3---pivibaketod.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/subisiraxi.pdfIn PDF document text
    • https://ms01bet.com/contents/files/59978054123.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/dokovirusik.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/wazorapunuronu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+custom+searchview+examplePDF 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_off0000c568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC568 16700 bytes
SHA-256: 030a000593b7c64ebaa40a44d1d4d75b19e6a4b7fc4ea2edd55e6b8ed7529a14
font_01_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 11112 bytes
SHA-256: 0bdd3440dafb76d4c39fc60b5e5753e09cba3052996382b273009a6d70675830
font_02_sfnt_off00010a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1