Malicious PDF — malware analysis report

Static analysis result for SHA-256 d120c8ec3d3c1a0b…

MALICIOUS

PDF

85.9 KB Created: 2021-07-05 02:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36bb44751ddb103c20c102bb0b3cb45e SHA-1: 55d5d9341324c0207d9e03c649d606612a42c994 SHA-256: d120c8ec3d3c1a0b57a8baac972345309808f60a48bf5f9f58259081feeee6a9
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 malware distribution attempt. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/4f13effbd9d816a4c879988953677bf8/muvon.pdf
    • https://proxus.nl/file/xozekefujavap.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608efb26e0bbd---28999139498.pdf
    • http://lbtech.kr/upfile/files/28053962442.pdf
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/94416336774.pdf
    • https://himalayanthailand.com/image/upload/File/8461984042.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/29397419ccc75aa420b32b32ed1cf76f/xapub.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a09bc5ffc7---10139376568.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/vabutodikijegekoj.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c028c8e6bf---zirusugarelezago.pdf
    • http://albino-pitti.com/pub_img/file/musetilora.pdf
    • http://sierrahighalumni.com/clients/878712/File/pifejibovag.pdf
    • http://hoskinspugs.net/clients/40498/File/11016208794.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083828694aca---vonupujuk.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab34aa84e2b---bowurizizevawanufomokijof.pdf
    • http://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/12051684496.pdf
    • http://czdashan.cn/uploadfile/file/2021050101290373499.pdf
    • https://pima-alarms.net/slicice/file/85470100377.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/pinesobetubetenapodoj.pdf
    • https://euroroma-bg.org/files/file/vogabevo.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a8671dd1789---29018090879.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23c44df912---lubowit.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+do+rainbow+snakes+eat
    • 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_off0000ecbb.bin
e7ea4859d3be4ccf5607e0b3a56a9740e25a44ffa2837df81ef89e4fd64d5e80
pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 17392 bytes
font_01_sfnt_off00011a06.bin
25db80ed5e8908310e34b38b1c2cc7659028dc2bafb6e15b0d0cd9db43934618
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A06 10612 bytes
font_02_sfnt_off00013249.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13249 16792 bytes