Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1bc5b2961c8eb62…

MALICIOUS

PDF

71.5 KB Created: 2021-10-01 10:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9c27e5c9c207256acc0c189d50a4f5d1 SHA-1: b5a7ccaaebb35228cff0fb4836ef1b578777def2 SHA-256: f1bc5b2961c8eb62a58d056edd9362eff14a19c38745c3329a09242b03263957
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=pride+and+prejudice+study+guide+answers+pdf PDF link annotation
    • http://purofirstli.com/userfiles/files/jimipotirovimo.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210924185138_346356722.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16151070384e85---rekoja.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/94091843693.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/bimolu.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/kamirovaxetumetad.pdfIn PDF document text
    • http://www.moyekolodin.com/files/nagaviv.pdfIn PDF document text
    • https://avela.md/userfiles/file/pafun.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/kulelotajinezubu.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/mujiteruvufidusibix.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/zeguzorawoliko.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/f75a5473df846f4a75477d74b19c160b/xupawudasifaweba.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/36392937903.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615187d086200---62283354519.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/pirututolijitijudelopepan.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/mupasaworov.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210913124940634993s4ju3.pdfIn PDF document text
    • https://camelcarpet.org/d/files/komirufagopadirodorixebaw.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/mejonanuw.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/bodakanabozejesu.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/83512299330.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/94374953819.pdfIn PDF document text
    • http://dongphat.net/upload/files/fanepavigizexevetofoko.pdfIn PDF document text
    • http://vhktn.at/images/content/files/60915852139.pdfIn 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://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_off0000b1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FF 17264 bytes
SHA-256: e2a7051677137dbeb1d97bc63f1c7a2278b3d0c9efb8f2d582012970c685b908
font_02_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 11060 bytes
SHA-256: 2e00d3b4e4767afc41a80969509db545e119a4de1035c56ec1fde742e4c7cda6

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