Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c1bcb991230e9e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 02:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 602d322c15873312a9539dbd114e5678 SHA-1: 78f8f763fd14925ac3ca5604db18ad86bfa054db SHA-256: e0c1bcb991230e9ee9cf66aaaac977ac69444bbc1a23b7d7f1c72fb189cd145c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, with several heuristics flagging them as potentially malicious or part of a link farm. One URI points directly to an IP address, and another to a compromised WordPress upload directory. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://akapacha.com/userfiles/file/56538604459.pdf In PDF document text
    • http://cmuniontravel.com/userfiles/files/buzegebopepelululomenib.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/pozumajudorotevajiboba.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a5157eac1---kopunavobefiwawilemuzotog.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610383c2d03ab---19513101749.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/72648330643.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/givodawofinejusavig.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b362821dc3956b458a636141778e036e/bokopegisoriketazove.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/69574183976.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaeff95380---50039883734.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16110e76e7dd35---birabexevulovilofelevipom.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/tugim.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/tu8qoqm0oj1usvjfm6o0q2gaf6/riwimegejamepidulewolo.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210623035954_aldlpa.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/35453393591.pdfPDF link annotation
    • http://ccswcd.com/userfiles/file/48340670075.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/rozawunur.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/48582723477.pdfIn PDF document text
    • http://merwepizza.com/upload/file/64576181544.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/18933333682.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/o76169mlflm81snjfrv7maoik5/24495878413.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/jefebisofexos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bluedio+ufo+plus+manualPDF 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_off0000df26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 19584 bytes
SHA-256: eb728696c2d273372df9b2a7493f4c10a42ed5294cc99910d99374fc8f3a0c25
font_01_sfnt_off000111a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BE 10612 bytes
SHA-256: c5562c57f82837dcfb2750a2d553ae074ee037a930d7f6a8dfbddbda27837dae

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