Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c6fd5235b50b81…

MALICIOUS

PDF

89.6 KB Created: 2021-08-26 04:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7987f7c92fee0269e90b7341bf99ab88 SHA-1: 600f28d9a345ef8b9bb5fbf489ae92f07bf04fa7 SHA-256: b6c6fd5235b50b810e1bfd0c83e9de0a249e547d325f0274acba380e71d6f1d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage, suggesting a link farm or phishing lure. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b81899cc---janowunoxixenet.pdf In PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/20c932fb0cbef54e02116ed1a2a26cf1/84260176536.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///61619317857.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/bufomutix.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/6081664447.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/bogusidoraridoruzutimozu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9badf6e3---61984838255.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/ketuzavofosu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e0ea08552---24573691268.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/taluzamupo.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/32396447748.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/janulipebi.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/gadodaravanevinalobovo.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/89891859455.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/bunalorulemogomuzawosusej.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e388978b---87421813330.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d05c8d1a6---javazoni.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/terupodapidokof.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d09caec2a6---fanekexelaralekaseveze.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b536c4813---96619553307.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/68152016900.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9da131778---wedepasiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+meaning+of+persistedPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fb1e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFB1E 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000c3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B6 22900 bytes
SHA-256: 48e5e087d6e0351e6cf103dd8fad537aaf0e2898027a898fb140204d18b283b8
font_02_sfnt_off000118b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off00012636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12636 10860 bytes
SHA-256: c5b938983ac083b2aabfd296c6c880d5d8ad840ce49eef89b820cfb61738a833
font_04_sfnt_off00013ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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