Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8a2ebfeaf48fa3…

MALICIOUS

PDF

77.7 KB Created: 2021-09-05 03:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6a7097406a5e3fd12368b07dbf37e8e0 SHA-1: 3715a1f53f120daae8d24a40f656e5c43e9ca5aa SHA-256: bf8a2ebfeaf48fa317860d3b6407db3a1f1f07ec4e5177931d04e7a502badac7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://roc.mn/uploads/files/xeruzanodepamipeme.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/30fbbd9a6ccaff1166a875212b67eeb7/biditabab.pdfIn PDF document text
    • https://citytrafik.nu/images/file/wiwimiwalezegulitidetok.pdfIn PDF document text
    • https://koratspring.com/upload/file/muvut.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d0e4215b0---xodikosakudepevop.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210612215615_vfuegz.pdfIn PDF document text
    • https://songhongresort.com/img/files/59705187142.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bddf6382c8---88959664716.pdfIn PDF document text
    • http://euro-ex.com/xinazurere.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/86233281493.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/60286400246.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/72072542631.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084400d924ac---79486663203.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/dejuwerebidanu.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-4/20210604101129372729.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea1761c077---kolakituxoti.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202172353394040.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8d3fb8debd766a42dea68b6b28f5599/dewuxu.pdfIn PDF document text
    • http://gyobel.it/public/file/fosom.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/1a9075501dd02ab90604381b1d59fd67/kibululafise.pdfIn PDF document text
    • http://geotersrl.it/file/22480042669.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/buxuwiminejefejuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=atonement+online+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_off0000cb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB44 10208 bytes
SHA-256: e9a2ade551fbea9f3b9d9e07be3f6852895dc0d5f22f77460a8ace3e6479214d
font_01_sfnt_off0000e217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 18104 bytes
SHA-256: 26e8063eb0f75ace0235d6397f0f41ebea90f5cd612a24afdda266be38b3981f