Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b02bcfc77fb38a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 10:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee8cac92d868e4a370d1909a863967cf SHA-1: acd739b3840e857bea95f5bb075e33bbe20559dc SHA-256: 82b02bcfc77fb38a0022b8d3eaf0a2d2fe3dfe7267412f63f185a0e034d529b8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to domains that appear to be compromised or disposable, suggesting a link farm or SEO poisoning tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary function appears to be redirecting users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://foto-recepty.sk/images/fotky/57586394998.pdf In PDF document text
    • https://egyiksem.hu/uploads/file/ziravukevug.pdfIn PDF document text
    • https://semut73.com/contents/files/taxegepanojidulitanoje.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/12405741540.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/0acef4e89a788bbf859c4825a687f8d4/tovuganakemutujasij.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/rebanawizorigo.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/6jb8a3foufvjc89qj073i40pcj/41131062635.pdfIn PDF document text
    • https://europartner2.pl/uploads/kerazikimivolifemajel.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/petoja.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/gejiz.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607212674ce77---bemire.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b22fb8a50df---botuwobinuzoril.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/28563835760.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/28533090614.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/likosunefuso.pdfIn PDF document text
    • https://artenika.pl/fck/file/7245964447.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/wisanalelipi.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/65705723310.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079532e881e3---potipojinixodemeb.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/11007360109.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc08a371dfc---vofuporabemuresa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=email+marketing+definition+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_off0000da90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 17156 bytes
SHA-256: b63c53b8a106a15489e61f1f404c80214fe851609b657d3c5c49440cd55ff232
font_01_sfnt_off0001075f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 10748 bytes
SHA-256: 44a67e5cfad6bdf05775bc6000bba30c35bcc18d871b79f35b922495881bc1e9
font_02_sfnt_off00011fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1