Malicious PDF — malware analysis report

Static analysis result for SHA-256 adce412226d21b19…

MALICIOUS

PDF

84.9 KB Created: 2021-08-15 18:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1e75a010f91ee3d812d282488d5c2707 SHA-1: d83631643b69a793f91f9e5c844728b4394e87d0 SHA-256: adce412226d21b1919a80c230a7a6c4503b83bac8f73973b51e751a977b6b146
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on compromised or disposable hosting. The embedded URLs, such as 'https://queure.ru/uplcv?utm_term=second+world+war+in+tamil+pdf+download', are likely used to redirect users to phishing or malware download sites. The PDF structure and numerous external links suggest an attempt to exploit SEO or user curiosity for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=second+world+war+in+tamil+pdf+download PDF link annotation
    • http://massintech.ru/img/outer/files/45064509941.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c613d24788---sejelaverolujid.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a6bba25c---78762115035.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/damefibuje.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/3531479089.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/22928949295.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c597cf13cf6---wugesinit.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/935f7f26bd1b818423d9f2f9f3e35439/veparujodasixuwomimenox.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/woxanenivarabijemipen.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/qrggh5k5rbrmfur8jk2sclhcr7/10826322173.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210731090253.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba56737e1a9---66439469185.pdfIn PDF document text
    • https://abeess.com/userfiles/file/dijolaniwivajotol.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/88013635207.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c51631a0e1d---lubako.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/61093344982.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/k6iaqhhkktn5kcg6vlufrsefoi/kijekakamadirajobigoli.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802de9ce024---80298384663.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/tavujejeritixer.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/12482768121.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/dejisiwafipesemevekijiv.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/13698332527.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247625e945---27539942877.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_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 16992 bytes
SHA-256: 888801fe459a11cae57305484f6fe801a2f71fbb834f1d3633677ceac9094cc8
font_01_sfnt_off000113ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE5 10772 bytes
SHA-256: 1008d8e6a9e27a0992e9d5079c93184bc5e372e19011932e122ce6db56c8dcb2

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