Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd28d37bc98376ea…

MALICIOUS

PDF

71.1 KB Created: 2021-09-01 21:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 69b97465ea11b8d0fd0f5a111a63239d SHA-1: 6b38e6d3a2459d75145c3a8ae28120825c911010 SHA-256: bd28d37bc98376ea86523d7745355082a6c36ae79c65a4e28296ff39abe8b12b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://eol.org.pe/ckfinder/userfiles/files/xetetaf.pdf In PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/fojazifetafilodudutuse.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/25477740243.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608897345f4cb---94448789491.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/sjgdnc3kllt3adhq9o4p4t46i0/pipebofavewim.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612902ef958b4---jisuwulibitidi.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da7ef9a1d1b---razoruwoxamisipa.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/febidegonuru.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/bafopax.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f89544aa9b---zobukevumoruxubebulesaj.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c6edd370de742c73523b823cee5149d6/gekigusol.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/4be45db295d0cdc73639e54a827eaf98/vixumasikidezuroj.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/73276401493.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1b2c0c27cd68871a096a61dc631c2800/44293785080.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610f007b10691---gikukisomimeregazemixefot.pdfIn PDF document text
    • http://ilkemymm.com/image/files/16426222208.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/jugitowuwojut.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/21716402705.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/337026a91487c3c5a169ca235408c082/tanujoj.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/708256446.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/pinadatuxabikitutakatoz.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1bbabbb92a---51739899538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+definition+of+array+in+mathPDF 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_off0000c0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F7 16516 bytes
SHA-256: 2584b7c2d9b70d52f23be3f12c303aa38fe553c63ac5c764d856f1ab48992085
font_01_sfnt_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001037d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 10680 bytes
SHA-256: 91ce01c4c96050e1813e14d717467d6989ee396c03e18acadcacc3b3850e81f1

Open this report in the interactive analyzer, or submit your own file for analysis.