Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ca7dc9ae35ca4c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 18:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de291ee26cdc1b088dc516e3d74b4d19 SHA-1: e0816f3523ae7db666c003bc4a41a41fac83b76c SHA-256: c7ca7dc9ae35ca4cd51e54b82ad90ab0712db349a3045ca4f14a2da7f6122adc
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites, likely to host malicious content or phishing pages. The document body is unreadable, but the URL structure and heuristic firings strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a567d770a77---93684243487.pdf In PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f26866bc1b1---36353331666.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/39702778667.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/vvlap3l8e6rvotko844vmgkb56/77474065605.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/28eee67d64140cb47dcea7db8e514fec/lizozenafivedudusiros.pdfIn PDF document text
    • http://hibertek.com/image/files/20210618_171924.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100b421f2c12---zobojopedaf.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b8202b995---30690697925.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/3d8d7c2bbe8bb86ddb4380769cb2310f/15460817649.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/luxufil.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef63f98499---46452681110.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4809fbdecc---bafuzowipixorimobifevi.pdfIn PDF document text
    • http://herve-coiffure.ci/files/rexopumuvilozotobolefisa.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/rd4btfo573sojsqg3hg44ciebt/fenakarakulaful.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/50231421776.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/39823411215.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/ad37500cf6ba2cac81e7709d1368acda/88052923272.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/37118014245.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/rekozipajo.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/surodefunuwunareviso.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/xuwinitajawupiduleweruru.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/susugepef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=la+comparsa+ernesto+lecuona+pdfPDF 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_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 18220 bytes
SHA-256: a9512fca2414eb0cf83e7b9a2b347b2900548732fb45118bab44b5f9f5ce8a52
font_01_sfnt_off0001081e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 10744 bytes
SHA-256: 299fe82f1a99e5675f8015654d509ed4d56b18c65564355003f33e342f317e11

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