Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1174665cd808e0f…

MALICIOUS

PDF

91.1 KB Created: 2021-08-04 01:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 858d59a6b83e348ff1668c7f96fa2712 SHA-1: f7b789e2117384b85987182316b0db6252e40e4c SHA-256: b1174665cd808e0f7b06d7ddb92c21e19403a0365e4806a6f6c810ed66eee087
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated, preventing analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843954b0ac0---tawupowapi.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c09b9ecc1d6---nobapujin.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/1l7fra5hv09ip7a20iuupaifp1/biliv.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/gadufoxokide.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608054553cd3f---12870599216.pdf
    • http://cpils.com/userfiles/file/jedadojoroxepofuxori.pdf
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/70600127516.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941af9b2d36---riboriwet.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086c04a84a70---suwupilavapujufatak.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/28a9772478159f18735879b8cee6ac19/zovesuvamobomagufenatexu.pdf
    • http://quatanggiabao.com/images/uploads/files/38451911364.pdf
    • http://emachn.com//data/attachment/file/jafavaxe.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735bf2cfb3c---kewujukutupevobor.pdf
    • http://aihyang.com/userfiles/file/71448655972.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/sazunesarimumujagukonak.pdf
    • http://cooperclassof1970.com/clients/9656/File/nedaxabifabisuzin.pdf
    • http://deeringbayrealestate.com/userfiles/files/17007231742.pdf
    • http://czapla-dachy.pl/public/images/fck/file/mijejasuxivubodoregamo.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a656d02928---84182437884.pdf
    • http://burfel.ru/upfiles/files/ravexidomebinikinenedumu.pdf
    • http://chaodontuonglai.vn/uploads/ck_upload/files/bixojitivexiwirajakudo.pdf
    • http://aryajob.com/user_upload/file/vexovuxinafewaw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+use+outlook+email+2020
    • 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_off0000fe5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 16792 bytes
font_01_sfnt_off00011671.bin
baa62593c0f0db27e817e16cd3a0cfebdc8ab6771295bafb045c8a085f617bd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 17968 bytes
font_02_sfnt_off00014558.bin
23eb808824b0a731376d8152d4d47204dc43a1a2b25277f86576a77763e19d1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14558 10576 bytes