Malicious PDF — malware analysis report

Static analysis result for SHA-256 dedc9597367d70ef…

MALICIOUS

PDF

90.1 KB Created: 2021-08-20 04:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4d6adb1100364e3a163a9301b90d15f SHA-1: b0c41b0d819b802e8c13ef78e589ee3a578df87d SHA-256: dedc9597367d70ef09d61c8999b259519e872ac1b32ff8ae6d6db29745288ca6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body is unreadable, but the heuristics indicate a pattern of linking to potentially malicious content hosted on disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/5ac4034474b43e64ca6e3898466dcd95/88173824382.pdf In PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/vrajkatev86gpkbov1bvsfmhib/gumiruditukabiwejogoj.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981c4173298---44528885219.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160727728100af---74850051328.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/madadegim.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/62952505.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/fofelonizopizukux.pdfIn PDF document text
    • https://capecoralliving.com/media/file/soxutikagomapezove.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/takaxijirajonerowiru.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mujupixuriveni.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/nevarutosufikurixivafufit.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b01e04a5b84---54317384319.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109ad2eb1d64---lajinikenokazit.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7153c704988ce9f5a4a96bfa14dc7498/88493600509.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/46140016304.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/h0vc4m5gcerc41ea865dnp39f4/wunokuzikoredurabe.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968d4502a5e---49691267160.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/380550bf32e94e49e4deb90d8ebe61b6/76176373343.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae66edfb62---82060656493.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/21259044463.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f25ec1f6---59064539923.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/befez.pdfIn PDF document text
    • http://standardamulet.com/files/files/bonanudivajuruduperaguf.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/nuliv.pdfIn PDF document text
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/51959119292.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/renanadowisuvenifinuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=juegos+dinamicas+para+jovenes+cristianosPDF 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_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 18532 bytes
SHA-256: a1f2526c9f576ae3af5f170f1a72b3b139ac097b276f5756c4e8400fd5e75662
font_02_sfnt_off00013fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA1 11096 bytes
SHA-256: 5facf6753044553ee96eba195e33eb39fbd61999a2ce4b583f849f9e10e70d0f