Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a13a0dc886ceb47…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 03:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce4a40bf4843c19cf9fec4537f81aba8 SHA-1: 35f1a1f3c24370c5ea7805dd3adeaef844955eab SHA-256: 6a13a0dc886ceb475505b62fcef298f17a2eb0a5a6ca42be3fe093072e00971e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. Heuristics indicate the PDF is a link farm and has been flagged by ML classifiers and ClamAV as malicious, likely a phishing or trojan delivery mechanism. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest an attempt to lead the user to a secondary malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=alien+shooter+hack+version PDF link annotation
    • http://kaiyudachem.com/filespath/files/20210921191059.pdfIn PDF document text
    • https://cabinetscounters.com/ckfinder/userfiles/files/zivetafepunal.pdfIn PDF document text
    • https://hgb.se/filer/file/ruwesefisekejojagi.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/23699432926.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f383f621e990e6a0b307fda81f47a4a1/bitovigude.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/xinupurudasan.pdfIn PDF document text
    • http://tianfonmm.com/d/files/werejewasore.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/33353908560.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/kenalupo.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/3896937587.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161423da570822---getopekiresobugo.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/94559292379.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210910210245.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/46369474620.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/deziju.pdfIn PDF document text
    • http://jawarakreasi.com/file/nodokovakugegupuvoxuwo.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/99875350350.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/lorugofitizebaj.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/0bokd4oh6eqtace2udm5vqpbak/47995089531.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/88770404301.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/garowowa.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/sutabilu.pdfIn PDF document text
    • http://asvpp.fr/pdf/33203468180.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_off0000b294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB294 17796 bytes
SHA-256: 5c940085e2be0a1ca0756bca65b871cdff1ba062d2078e7be4f064bb515e5d7c
font_01_sfnt_off0000e019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 10468 bytes
SHA-256: 3d819c5df5489f411377c34a5ebfd978a839dabb144d09d94176da5eb53a541c