Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c29696263a8bdd1…

MALICIOUS

PDF

87.7 KB Created: 2021-09-12 13:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa71a3ec1bf5a81fd72cc749ffa8333f SHA-1: 8ac7d02cef7a33c78ea74aac942e9f5509506ccb SHA-256: 9c29696263a8bdd14d20be85868e8037e3ae2fc5836fc419b619384a74aac720
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on potentially compromised WordPress uploads and disposable domains, designed to redirect users to other PDF files. The embedded URLs, while some are marked benign, are part of a larger network of redirects, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6111e254---46225951930.pdf
    • https://museuminiaturesbesalu.com/files/13014336019.pdf
    • http://harlit.com/ckfinder/userfiles/files/20210911_145146.pdf
    • http://ingore.cn/upload/files/rateramimapusogi.pdf
    • http://gaudi.tw/upload/file/78584484040.pdf
    • http://cobansut.com/userfiles/file/40306148767.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/faac55cebb3492226ca6aa9d6a3c9021/64964414539.pdf
    • http://cathugo-yachts.de/res/wysiwyg/file/29500837254.pdf
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/bafezulazilobulixekul.pdf
    • http://www.naturhalles.fr/fckeditor/userfiles/file/xuturanego.pdf
    • http://dtyxbpzx.com/filespath/files/20210909221828.pdf
    • https://trsoftyazilim.com/genelresimler/file/25391834765.pdf
    • https://bccphil.paramedix.biz/uploadfiles/file/folorodesaned.pdf
    • https://csodamalom.hu/files/files/61896511234.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/k1oidg02k6jjigivqg663953q4/63393619599.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/dudepili.pdf
    • http://thayloilocnuoctaihanoi.net/upload/files/61444274591.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c0fb070b1d8648bb9ec4efaba0919401/baguwosijabetad.pdf
    • http://halongbaycruises.org/upload/files/jelosomubenokuxuvisap.pdf
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/rupazidorejijanen.pdf
    • http://netart.hu/userfiles/file/gotifegezotof.pdf
    • http://byecook.com/ckupload/files/rozevaparovunerabiw.pdf
    • http://westernstudioservice.com/admin/userfiles/file/kaluraxegi.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/pajupenemowazeso.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+play+mugen+games+on+android
    • 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_off0000f147.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 16792 bytes
font_01_sfnt_off0001095e.bin
3f8733f0be75865ffb4f69258ec897919b4b6e4daf8f51809c6dcca076f9c899
pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 11024 bytes
font_02_sfnt_off000122d5.bin
c0a35ecc8ebe3a86b52d4ca1c6cedb5e9dc72baf02f054bd6e59a947caf853ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 17876 bytes