Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fb932e6e656ab0…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 15:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d3fca069ce2d8c3d24c485ca54e0de9 SHA-1: 71f64c2749d015bca507361a7e994478eedb3320 SHA-256: c1fb932e6e656ab0c91f83ce226f5295a4e22ee575d5395aa6aed474a5917483
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or scam attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and the presence of 'utm_term=pet+care+claim+form+pdf' in one URL strongly suggests a lure related to pet care claims. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160983255812b2---puzelal.pdf In PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/51875407638.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/39102718981.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24b2a1c804---79172223071.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/813025caa5ce022de8de990fd92b4f14/revuwa.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/45253598151.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/o1e8m7s8ai1op5e2cq4tk7lu64/97057337590.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/59193870722.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/qr7aqu08s3vtdfjd3somv1gp21/zolexusug.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9ac0265bf---87574134310.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0419db16268ba2c7f33d1d255efd0a71/mejamaka.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073335e0873d---temisepezefuxumo.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/2509266437.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/83754258485.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/jexopuxabiwagisitapanoxax.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d487351b1---zesaxipa.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/18797278122.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f5de949ae---82543700638.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/vepowomes.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/60889002712.pdfIn PDF document text
    • http://chinahongji.com/d/files/ginij.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ebe6261d2---sokamad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pet+care+claim+form+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_off0000d71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71A 10508 bytes
SHA-256: 6a1feaeb2dce3f0b034344be0d4d73790666e6f35815de6ce632c305fd828df6
font_01_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 17056 bytes
SHA-256: bf5ede687d7d7b63ab59b60237f49de9f623de9a3124895d4ab4d623867a3215

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