Malicious PDF — malware analysis report

Static analysis result for SHA-256 781ec2bd8a00bdd1…

MALICIOUS

PDF

82.5 KB Created: 2021-08-26 10:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b8b3f95edd2940738f04c1a8f9884af5 SHA-1: 236477cdeb39e7c271c596d083aab926bf11b855 SHA-256: 781ec2bd8a00bdd1115a4570c538f452b689d65615a86c54875fcb1636a77c37
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://ankaser.com/userfiles/file/98286149924.pdf In PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fa506c47a942ebfae919771d26eb90a/13813412317.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16099aee82f0b9---51942177511.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/35891788914.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cb7e6486e---xatekifapumigola.pdfIn PDF document text
    • http://goldmustang.ru/files/files/pisamajatuwelabutevilinaj.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/xazeg.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/xobanajotetas.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/najijob.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c00f10cae70---46845031199.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210724_1FD57BD334F2A79C.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f543e2e428ae9384a7c9a5790fda6c17/fasawidobamibisaf.pdfIn PDF document text
    • http://teifsepahan.com/files/file/lexabojosizitefupu.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/lozineg.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/84906019684.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/80589665273.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c359328072---28460832052.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19483074847.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4ce7923b9---89082609222.pdfIn PDF document text
    • http://trinkhorn.org/userfiles/levana.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/vodibakuwotaviw.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a15b922f48d---merobivatalabakudub.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/575aa0bfbt0111snu5hu3bcbn6/bamilapopaboraj.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/13565ad4aa86ac893eadf455d7011b63/14639276922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ough+words+that+sound+like+ooPDF 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_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 17248 bytes
SHA-256: 2ccd4b184848dad9d5f1058c4c05338f125e504a32fa97fb0ca9652be32ff6de
font_01_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001238a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238A 10832 bytes
SHA-256: bdac40af9b514b94efb2de4fc5682dee7fd39efe30cccbe333a754d217bdc4ba

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