Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2cf5004cfa1d4da…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 20:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00b539007d3dc6a91adc898eb6fe8002 SHA-1: d3f1a5954cf1d60c25ce037585c7d4bcfdca7dc1 SHA-256: a2cf5004cfa1d4da2d6d25b52fdfe2a210cf51103c27965a3c789233a7290475
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of these link farms suggests an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://reikihaus.com/clients/75291/File/98154344737.pdf In PDF document text
    • https://leo.tw/upload/ckeditor/files/munemosawipaniruxevo.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/52662128543.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/74729901173.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5543e7b801---99241994863.pdfIn PDF document text
    • http://carszana.com/image/upload/File/vipelutuloxosexofasazitik.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mdfrlu6stp54sqjehsg20312fk/vewotufunulijuxix.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/epucfkijp88qupmvdotdplnheo/verufigutatusaxuzojadom.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4e0123c34---semibomupujid.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/gitosutexejuketi.pdfIn PDF document text
    • http://szwygs.com/upload/jorebur.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/04810fb42dbbdd6c401795c66d143620/nologanevoga.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/22541449606.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/3568618425.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa03109ffc---vuruxarob.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/zisakiwozopimovejorelo.pdfIn PDF document text
    • https://elitediesel.com.br/ckeditor/ckfinder/userfiles/files/nizezakorusolorenagokaja.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/wubufusajugiworemapob.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/97016744172.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/7e63e49293e6ade61e6baae999d277d9/kiwizujesipovub.pdfIn PDF document text
    • https://egf.tw/test2/images/file/62716044146.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/ziduwowududenosu.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/49913574730.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/57813399642.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b82668c2712---pimukokegadivumozutuveri.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc22741de---23867318370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=possessive+pronouns+worksheets+pdf+grade+4PDF 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_off0000d606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 18364 bytes
SHA-256: 6df5b861354d165212c6f3aca8d21ac3250e11e820d236aedcc416c8d8ae3e47
font_01_sfnt_off00010593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 11152 bytes
SHA-256: 71235f160cd00e0539ad04e508bda66c1862ac1dc1fb3e9189a45e47db97e2ee
font_02_sfnt_off00011f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1