Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e3ca645e077dfe…

MALICIOUS

PDF

86.7 KB Created: 2021-10-09 08:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6b53d20971c17d430e0e479ba1081b95 SHA-1: e743fb00fd02f32998d68346c1ff3256e0febba4 SHA-256: 95e3ca645e077dfea18f50fb1f9c22cb4a80d6a8bb280e6294516683fe23bbff
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a credential harvesting lure. The document's content, though heavily obfuscated in the provided excerpt, is designed to trick users into providing sensitive information, likely by impersonating an MFA or one-time code verification. The presence of numerous external URLs, many hosted on compromised or disposable domains, further supports its role as a phishing distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://cructi.ru/uplcv?utm_term=psn+recovery+email PDF link annotation
    • http://otvorene-srdce.sk/userfiles/file/29188901628.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/mapidijidedoweparukit.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-01-21-50-34-gDGInt88.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/lobesokomukeriminirofoba.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/11529942449.pdfIn PDF document text
    • https://andrejc.si/files/file/ziguzaxunofotoseperotapix.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/letidu.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/wipesupugabu.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/12658396998.pdfIn PDF document text
    • http://cresapumc.org/files/file/7380563830.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/13992060669.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f505d15918---zejulatisuf.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/fotexuwirexuxexuneleluki.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/10/files/211004122707.pdfIn PDF document text
    • https://spyboarcams.com/files/94241365035.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/vubamizefegike.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/53848487553.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6edc3d42c---xijatose.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/zunazegufafawo.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/3721311892.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b197dda00a---19114021614.pdfIn PDF document text
    • http://nincity.de/inline/file/26367753401.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/18437077365.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/15972857414.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3cd42926---ratifib.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/38061799263.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/99933270015.pdfIn PDF document text
    • 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_off0000ed00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 18140 bytes
SHA-256: 573dd103f2ac8e41e7ddd8bc41904001373e2351a63d0b3fce490e8df2ae5ade
font_01_sfnt_off00011ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13502 10472 bytes
SHA-256: a5bce247e23e7712c5e14d8c06cf76ca46afc8cbe1d5769cc6a850ed8fafe5d7

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