Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cfaebf2824f446…

MALICIOUS

PDF

98.2 KB Created: 2021-09-01 10:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 121726c2a37a7e2ff0e94069bbfb8b19 SHA-1: 5fa5403d4d258c828673eee120b7ee416228c049 SHA-256: 71cfaebf2824f44687ca4e23b8d5adb71915e439df6b55adfdc98c73f79fbeed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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://chcial.ru/uplcv?utm_term=another+term+for+sisterhood PDF link annotation
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/pidurujulipupeb.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/fefin.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/pipebibapafamulolubizok.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97913552729.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/sororukoletadulasurubupi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6faed65fa---kowanon.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072799e52146---mawir.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/d62e28bc707730ec2d7ed5dea743176f/povatasofidemip.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c858f2e5b6c---1341372781.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/52o0h7r2mslqqv5gm9lj8ig0hg/57301099504.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/dapelasakimugemajonezige.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/ranegodugaxakiso.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/junirozagupumesunagozewog.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/laliwobuseje.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607233495447c---90435998911.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f67ef969ef---vaxekesiborevoruzubiruku.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/80678208880.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d547615383d---kesaxanupijigejaja.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/29768349695.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00781ab77d---88684955109.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/44qu7hjelv23cl3r16j8c9csbk/wiket.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fifanuzokokalukuxevuloba.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/c0ca1ce46e0665e1c4dfe162aa25752c/tiwevojanosevalete.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db23778a372---wapobipatorime.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/fevizalipatugirefazofizo.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7e7330b2---67430955674.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11007 23408 bytes
SHA-256: 1fe43b55f83cddc1cce24be841b5056a43daa031aa963261bb9a5381dfaa51d1
font_02_sfnt_off00014bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB8 10392 bytes
SHA-256: 3f84192b900479329c5f37e1ec9f6d7313b0b58da07372df35a6d6a0fb468f38
font_03_sfnt_off00016308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16308 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7

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