Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac1b9ed2ba23f07…

MALICIOUS

PDF

74.1 KB Created: 2021-09-02 04:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: deb2107aa4c3b6f32e1e92e0c0934181 SHA-1: 414ca4fdea5c68028fc2ff462fe3395ca92ea3e0 SHA-256: bac1b9ed2ba23f0769074c3b5722cec09d520485210416f47c98cbd05dd7d296
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing pages or download further malware. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://crysiq.ru/uplcv?utm_term=airbrush+artists+near+me PDF link annotation
    • https://tekartltd.com/upload/files/49312465639.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160742b850d112---xuziletijanotedizixejifo.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/9ipq8sjiful058i599bqeh2472/fimujoparade.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/3cv5vq6qv05qs0v0s58ilk3c85/63349667478.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741b6fe31f4---55798731141.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2d8a55e82---nalixo.pdfIn PDF document text
    • https://arerp.kr/data/file///18315925368.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/4522833136.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/tiwigejibapogikof.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608246d2ce262---wemedesipaba.pdfIn PDF document text
    • https://aedwea.com/upload/foto/kibegekeb.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080e3dcacf27---zaniwoduzetukobukufid.pdfIn PDF document text
    • http://spiregene.com/image/files/20210825_204354.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/33006093938.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/79337662105.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/60817368371.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5357819ab7---47048128067.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/73374161626.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608f824f85459---venotinomewidofamepujox.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/95464567542.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/gukigije.pdfIn PDF document text
    • http://hkalc.com/userfiles/gufegiza.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/kobuvulikatekuziv.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_off0000bfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA5 10428 bytes
SHA-256: e715bbc048fb370c6affd67af59aa741f7734bfe21239c39f1516e3ec7835f75
font_01_sfnt_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 16640 bytes
SHA-256: 011193073edac99e101aa98babdbc75214dc99a7d16d904ca4979d27265168a5
font_02_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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