Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c602bc38ab1abc7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 17:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57bc571dd7869e4ef30f7c610f2ec744 SHA-1: fb2f13d088fdd5778d5ed26d126ec81bdae7e5d3 SHA-256: 8c602bc38ab1abc7436942e1612ad84202c3d55f9141a1d2544055e568b8c304
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 numerous embedded URLs pointing to compromised or disposable domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://grubstreet.ca/ckfinder/userfiles/files/bipuripalebegozobadekop.pdf In PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/tuziwemelozi.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/binusewofodobusazosida.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161360bd4a877a---tuvujetovixawexe.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ac11be0e3386a59e4952155460495b2c/49155081393.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135758b04573---21393331583.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/47492404503.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/73045532214.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301192a2f01---16436204524.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/zerudupupotirog.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/63196127980.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/76573209848.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/90476849933.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/tedoxa.pdfIn PDF document text
    • http://teifsepahan.com/files/file/19043325368.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/jazajixotok.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/jefodeluf.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/ef3b33dbf8a629617a3b84b42d3fee9b/11633020450.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/64984252435.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090413212781.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/gabukefur.pdfIn PDF document text
    • http://hzqzg.com/d/files/44564817038.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/11000967485.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3e657be9e---15992903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sun+and+moon+set+symbolsPDF 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_off0000d4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 10644 bytes
SHA-256: 576f9a7676d48708e2a35c672f303f56dce78b263db22cc246c447492b2fa84e
font_02_sfnt_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 17824 bytes
SHA-256: f183d37eda15481df7c386141f8b506aebc655fe81c97678ef8e21ce2f994ce9

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