Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83dadaaca3833fb…

MALICIOUS

PDF

84.8 KB Created: 2021-07-14 03:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a38f3f8fd8cfd1d05366d1fb1dc47a5f SHA-1: 179a733f47ff40b2a5b3ea8ef8bfb0bfd24f5c1f SHA-256: c83dadaaca3833fb1e585c06d9b2980b1524226799daa4209724c2e3805e262d
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 storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure suggests the PDF acts as a lure, directing users to external resources that likely host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://stef-nancy.fr/upload/document/bemexinujunikiri.pdf In PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/76091705282.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/77361426676.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/cd969e070c1856d433810e6f2bc6bcfe/fogefazovumejabulaxox.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/telupiwinagufi.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/rufimamuvigaki.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80058291594.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/zitopezezakesedixit.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/62791239047.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/k9gn6fi9eb7ot1o8u66cv2k5b6/46188156304.pdfIn PDF document text
    • http://nipissing-lodge.com/clients/b/be/be32fa5c9d1e5a871f1efa0d35b29fe7/File/nasoletotifumoxugani.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780e1213245---65000717099.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f97669e211235afe4d89be71151bca4e/54964492901.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc07577c6d---92997335795.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/31293432698.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/nukesexokonefavu.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/90592947160.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/33128587662.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/98963031239.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/umrq46an3fe0pkd5v068d3psjv/vepizabobiwalifexade.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/29959068887.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/f6v79kesdu34j3vb9rg55kcjpo/dozabujokukebavilipix.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a8dab1683---83717394678.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772b3253fd6---84827022385.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/4336062167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sitting+reference+drawingPDF 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_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 10480 bytes
SHA-256: 7da85f0749dc53a9125d51ba8a2c6aa62f35fccfae6ea5289bd2f87ab3a01ae3
font_01_sfnt_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001190d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190D 17092 bytes
SHA-256: 9888b2aa67e552e43016e1ffdc6e7b65317ef873c6c1dfe81c16e1972078385f