Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f21a97a78bf78c1…

MALICIOUS

PDF

88.9 KB Created: 2021-09-18 10:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fcfb0c6562e62951d7d080633d39620d SHA-1: 99f205950769beb4cafc597a131f2e7893260730 SHA-256: 3f21a97a78bf78c1b7515c3cf190794ed7adcebe792384c761fda91c8a745a21
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains. These links likely serve to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://krisoc.ru/uplcv?utm_term=how+to+share+apps+from+iphone+to+android PDF link annotation
    • http://manisafar.com/basefile/marcosafarir/files/71358297445.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/60196444380.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/vibav.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/20692514972.pdfIn PDF document text
    • http://cycling-software.com/files/file/gesokamamovapotusozujed.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/sepimavofemo.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/nemipibezojimupademebu.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/vabajapakodazobopisisure.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d3bcecb76cf1e8212832f02acc0f29f5/34674418816.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/lazoxafudomakak.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/vujavisizujakunute.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/palelofelawanitewofugese.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/vimadoroxiwalawugati.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/f4e40634ebd9a53751af8e1b796c0d39/xujugiriduberumuz.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/42408202795.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/35906816640.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/nodoketiximakazokapudi.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/19553125627.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/19205563882.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16145877063f81---19074523189.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/f53527e0b5a8e5d9d33bd05643e579e2/kawexejupametukawopoluvix.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/kasofulegutat.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/82841890755.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/vowaz.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/5678788821.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/33264727583.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_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAD 10792 bytes
SHA-256: 399903922ea3b3e9615712e7873fe0e2c7d7539853c83434bcb347cb9e754776
font_02_sfnt_off0001235e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235E 19140 bytes
SHA-256: cd648f34f3e7426bf4c7676882f162b19f75dc3202f229c7b2bacbb93467bf0c

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