Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7b206cd92fb6ee…

MALICIOUS

PDF

81.7 KB Created: 2021-10-14 13:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 21aa34f677df426aff52144ece221f18 SHA-1: 94242a82b101ec6c49084c7024117a96df5ac0a8 SHA-256: 3f7b206cd92fb6eeae1db28924df5112226bdf8dfbe62224d338f948a0b4021c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and a link farm heuristic suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nadiadsa.org/userfiles/file/fesodatosijumetebapudaw.pdf In PDF document text
    • http://potlista.com/file/files/wularagavubenaxuwedi.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/69829220861.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1e47bfe78---romiralesinodulotew.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jeruvijilenivali.pdfIn PDF document text
    • http://gerocuki.hu/user/file/77025305338.pdfIn PDF document text
    • https://bachson.net/upload/file/vagenuvenasime.pdfIn PDF document text
    • http://xn--299a941ap1h.com/userfiles/file/20210921164601.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/marip.pdfIn PDF document text
    • http://asvpp.fr/pdf/pulivoj.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/situmiv.pdfIn PDF document text
    • http://azizolace.cz/images/file/54449577255.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/161588a7837376---2905074915.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/79992436462.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/negowulatifevuretunoxi.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/37170788170.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/88e0cc8a068ba502a8a1622636fba754/44119513279.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613576ba3656c---35646677126.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/14487631781.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/39435507500.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/55059383049.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/43747483575.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/wugurajokotopirubasi.pdfIn PDF document text
    • http://aquatherm-graz.at/files/vojepuxibafu.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/rumotimo.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=call+of+duty+world+at+war+wii+isoPDF 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_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 10440 bytes
SHA-256: c99ed661044d019f05335619de398a84b8e41e73d0161c44a9938da42c5ccfa2
font_01_sfnt_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 19036 bytes
SHA-256: 3066793cd2b84303425f6bb8044eb00a978fee6519f71e3fb66e5f40c8b377c1

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