Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9effd595b27ac33…

MALICIOUS

PDF

94.2 KB Created: 2021-09-06 12:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 37065abdb88f75e2aa5806639088473a SHA-1: 4f29b65a899e59ad79270ec061da3f4b1fbf38a2 SHA-256: e9effd595b27ac330a5e27abe4ae572c17ca73d6e667ddad3081e5fa8ae0ee3f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains identified as compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://amy-tsai.com/images_express/userfiles/files/mulako.pdf In PDF document text
    • http://universalgroupautos.com/files/others/27782219401.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/6446878205.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160988aa76c995---41189656641.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b526116d3d9---64952645853.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085f102da4b7---sekunowakupawefevase.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/22879184433.pdfIn PDF document text
    • https://anfauglir.com/images/file/tusopav.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8263d0f5e8---43212153045.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/76553251916.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/54778365651.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/wupebutusivefarigewuriz.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611da2ef8b3c7---litijotez.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/laledonevamuzafuvupam.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/46369797945.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3341aabb0---36017707717.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ab213892---dadobowejitidavurot.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-30/20210730024736698553.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/673edff1c43e17dbb23cbd743b58bdfa/394066286.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/zelisudogiwanise.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/5979846706.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/xirobibesagij.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/podorewur.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/dbb65a255f3dc773ac3eb2848bed83e6/rekutogamifasosirumine.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/famumusawenu.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/tewefasamovix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gedichtinterpretation+beispiel+pdfPDF 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_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 10896 bytes
SHA-256: b35ce1b03e29f72d5922931bf978293d99a55c1df6b5d69c559d69f835487e54
font_01_sfnt_off000120c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C1 19988 bytes
SHA-256: df003d9785fee3c8203050dea18fc4028dce9906c5d7ffc02c7c308d239b4d25
font_02_sfnt_off000152df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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