Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2e1df257a7e187…

MALICIOUS

PDF

73.3 KB Created: 2021-09-06 13:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2064c82ee3844a418bdabefd041d0ba SHA-1: caa435f0bd3df3a232838cf24a7720d82850100b SHA-256: 0a2e1df257a7e187da6b9b88cc7ddae0f0f7713d87f096ceb4ff4cca1483a0ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document's structure and the nature of the URLs suggest it's part of a campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://allytemp.ru/uplcv?utm_term=glucidos+quimica+pdf PDF link annotation
    • https://hssanesteban.cl/files/63848376570.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd682ce1d6e---kokunivukugefababulapag.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/58563171634.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/nozugudifetazopifakudepi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6be1eaa7828afc2d36bf2c9542099c28/37818245898.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/4328568689.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6d21c280---xorazojod.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/69900562492.pdfIn PDF document text
    • http://isvpro.com/custom/files/pixipobuvuxatupumupimonu.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/8b6ed301dd334104380143c6bd361834/wofolezite.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/0e62ee724229b83d6939057125bd4cd7/gekuduxatavutinusilikek.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/72112636482.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/56555159932.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/7769feea993560697b26c6bff3272a94/zomomofepete.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/83286310522.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/deduvinebifopozana.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160da710b10f06---29606597193.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/rirafipafulu.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/merosedilebutopum.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/bawopega.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/86869756345.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/91899918488.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4bdd4036ecaf2f3a411945ec7720b4a7/mopoti.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/84149520508.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/58558440254.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/b26dedln5v7fn5dac638sd65ea/lamedijekefonatamirubiber.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_off0000bf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 10632 bytes
SHA-256: 4b6f7b400066b19f2d4e03c743592336d33359135de697c41ad28a27ddeef683
font_02_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 15844 bytes
SHA-256: 5008b6b32ad831438b069a9221dd73c4f0557e38611557e9c86456625395fe24

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