Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38aca5c1a7571a8…

MALICIOUS

PDF

75.6 KB Created: 2021-08-08 21:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d789093cb62e701e742cc419e594673f SHA-1: 8fe59c4f4b1c2714f08755efffc387c271635697 SHA-256: d38aca5c1a7571a83b457d82235945a243ee3c27680accf17f47cd493f88adae
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3uh37p3tcvqba65m25taom5pr6/barubutenibuvikubebiwemos.pdf
    • https://ludifrance.fr/userfiles/file/33050734721.pdf
    • https://airshow-bg.com/file/mexivaw.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dd4e5bb31---sapimisumunavogiwerelax.pdf
    • https://nilsagame.com/calisma2/files/uploads/1996187586.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985ce16db0c---jejemomomix.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/65608663194.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36bb46993d---42551913866.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/9a72e7246ee4ef4bd27790c51fbe6813/29267512072.pdf
    • http://avon-bratislava.sk/files/files/forarewolapu.pdf
    • http://fzsvybbs.at/userfiles/file/91757455283.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/d41fad025fb2c2a419ac33f05c4e83f4/56114137512.pdf
    • http://esipro.lu/userfiles/file/53183531730.pdf
    • https://mimpiindah88.com/contents//files/48591350429.pdf
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/xenelezuduvuvarofot.pdf
    • https://chptravel.ir/data/file/85906932719.pdf
    • http://garantc.ru/userfiles/file/nisexadabubawek.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607daacd0d713---89051998313.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/52233859769.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1e4b1a58a4b93cbaa6d6b795ad1a62a9/34290382001.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/99th55a9avp10fgmq2krcgnce7/fuxudarovekudevota.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ee0427f85fc656faa9e9ab09455c3a76/40570535628.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e414878bf---28758425045.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pearson+edexcel+gcse+biology+textbook+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c39c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC39C 16792 bytes
font_01_sfnt_off0000dbb3.bin
4e8f58e713d38f6fd50b9ecf7c2527819f2bae452ef8041b35f6a8bf877614de
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 11080 bytes
font_02_sfnt_off0000f587.bin
7269c4af7c60d5492fc1c8a2d00a6016e7a6ef5897002823d8b7a40f7fab198b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 16680 bytes