Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f34e6fc68e814fb…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 19:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9068d88de3c265d6158c0bda8cb6182c SHA-1: 32c5f1ac24360084b6d6ec10975c0ea4e105c532 SHA-256: 8f34e6fc68e814fb6f308e9030dc7b871262c3c8bb4ba4268430df41e52e5712
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document's structure and URL patterns are consistent with a link farm designed to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://allytemp.ru/uplcv?utm_term=fastboot+apk+install PDF link annotation
    • http://siciny.eu/userfiles/file/62345193907.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/b95dd9cf5adacf5183c49d89b4960556/97936563303.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/47067999492.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090718445139.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/11237234989.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/gasurinisej.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/95091024009.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/94506508938.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/koligew.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/jozemudewatesewolifitu.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/jimage.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/69802417520.pdfIn PDF document text
    • http://amandamaitland.com/images/file/2470786288.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5489ae19c---resuxirobivopaganorazi.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/eb56822221425116662aed68a5eb57c1/92543430302.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/lalaraxuzabatinugu.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/mapanerexirezidi.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/wewemixej.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/60528801605.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/ruxivumepabubug.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/15582543048.pdfIn PDF document text
    • https://adikketiga.com/contents/files/67529351370.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c822d93fb1---27078854211.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613328684700f---29251780462.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/zijozokanixaxetun.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_off0000b2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B6 10220 bytes
SHA-256: 4076838805d9746f068e63bda263e0cd927cd1352ca876b77a3107b2bee058dc
font_01_sfnt_off0000c97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 17792 bytes
SHA-256: 567ae42928bbe6762ea7ba43a11cc3cbb3dda4741f8629cb4fbc43b5c70c2f58

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