Malicious PDF — malware analysis report

Static analysis result for SHA-256 be577d7c2714edd6…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 08:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 91e1898bf07b42113c2dd9b7570e470b SHA-1: 58431ae5088ace4dbc638c02d185a01607ef05bf SHA-256: be577d7c2714edd6d8d888b8a11dadde2ff31df913f6ff5d9b112927d39948a2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://huntic.ru/uplcv?utm_term=board+game+apk PDF link annotation
    • http://tropo-design.com/ckfinder/userfiles/files/66821734745.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/41388435038.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/maturivifalikatifexavip.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/zagawaxafulufumeretewo.pdfIn PDF document text
    • https://vestol.bg/files/file/31780825504.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd07e1ec9b---58491074437.pdfIn PDF document text
    • http://tion.hu/upload/file/66384435240.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/60689011277.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/78890198002.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/zojotadatafozuboris.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/rogosenigugur.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210907005331_kkb8l8.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109161015039193.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/wabositapu.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/47952283686.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2fd96c4969bbefb0b139b72a8824b587/91415095712.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/6162568501.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/xolojo.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/71725915611.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/relobabetotexetutalumupot.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/zevobojukaxulagipodeb.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/0e670f78811f7da19eba3756a9b52953/86380136436.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/rajixigogezozidukuli.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_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 10372 bytes
SHA-256: e73ae157299e682ce043126783136d6a718759559fc4344bc52151d9e4035ec5
font_01_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 17172 bytes
SHA-256: 12923ce33f06c97ab8f3957432116e5b6da29a661a10a2a8591885f0d8be4599