Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2e9a3910391b5e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 11:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9ed3efabd1c7322df915da6a7ff43aa SHA-1: eaf39336ecda05d09fac2702e0cceaa4bd789aea SHA-256: 4c2e9a3910391b5e533b97cd2fb50e27cbe952c26de968cab5fa9869a7290bfc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to external sites. The presence of multiple distinct hosts and UTM parameters in some URLs further supports the link farm and potential phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://iwnta.com/userfiles/file/60770896660.pdf In PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/rokemateketimitelukonir.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/zoroledizo.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df27d7c11d---74881840126.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/tr8faspmib0fl8e561451l7vrm/fisavamerizapavemujefed.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a01c3bc8c---xegitudadosuwofelopeg.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab228bd2903---70054701468.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaf1d4251a---50204665635.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/lemudubase.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/64174433545.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/45607040027.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/bc0a79d6009400a31acd966cabaf3c2f/83206529813.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/846fc8face818c26a8a60b6bd5fe0ec9/22293017807.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/lukisov.pdfIn PDF document text
    • https://actorconseil.com/files/file/wujexurir.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/59fa46a3b4600420cf802116cf5a181c/51904953264.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/gudedoxa.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/mepekonigojebek.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c86a6b1a35d---29984908577.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/kelaladutulizub.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/texozapomenetilonijida.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1612654ce12d12---gigobobaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=chemotherapy+drugs+classification+pdfPDF 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_off0000e247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE247 18384 bytes
SHA-256: 8e378a2359cee275f47e30f91dfceec9924dfecb7a466238ed7e7daf7b393725
font_01_sfnt_off00011148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11148 11312 bytes
SHA-256: f37093457d8759e1cff7ea755e7b07dbe8637ba6bae0557f3ecea9198c76e5c1
font_02_sfnt_off00012b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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