Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1732f5cc3d654b…

MALICIOUS

PDF

69.1 KB Created: 2021-06-06 21:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 410af8fb5fe55c880aa411979d45b3c7 SHA-1: 8514bd36b470a6f898091e56b68c68fcbb7962b3 SHA-256: fa1732f5cc3d654b18656fab34839139e3a8cfced6aff0760d90f8e9f41355cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a common tactic of using documents to host redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=ge+universal+remote+24944+v3+codes PDF link annotation
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f838e4a39e60f3cc00bafedfc9bab81a/zopigirutiw.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/jojovuvimogopugosugobu.pdfIn PDF document text
    • http://blueyee.com/upload/file/241507019856.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986d1f734bf---72123228747.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/0d963918be5998030209f4282fadadf1/xivozotuwiko.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/f6jpjgi8ra09n1ddg9ef4jlv9l/wumefogejibupukoke.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed63454967---kanarugadaxexodi.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/tegemezivanarozexexozumax.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/7ga6ot51gg1ko1348cm9j8mj36/28871662946.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/34848319678.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/1a8355d087ffd2da2974caab95c22f3c/68351916713.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f032a9eaa---35863281976.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945f6becc76---xuboxobutopisudar.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/xelolaxoravawogupujitut.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/28/file/20210528_152452_177.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/44706691200.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/1bf1b39c0f70af1710394703a3de3c22/53616875626.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06D 5716 bytes
SHA-256: 06119d2b070914c6aba8d69160ec653452590c5ee2b58170a1ef52a3c58ebdd6
font_01_sfnt_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 10372 bytes
SHA-256: 39782a546c881307ba341bf8c37524679952aeb08bbc0b32e8ecb5783243ca64