Malicious PDF — malware analysis report

Static analysis result for SHA-256 8143aea1e060c013…

MALICIOUS

PDF

100.4 KB Created: 2021-07-19 23:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 993e9b104b0d7e763adf75103597ca81 SHA-1: 57636c581d4291d2b28bb065d7c4cc4e15bb0311 SHA-256: 8143aea1e060c013ff3c12febc7e5980f0ff5b8d62fb157cb54dd2d80f2eecb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160868ee764ec3---vokafevilulipe.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607f30c032b3f---debijiz.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e546327a1a---vivopaguzoxasumumi.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03c8abeb68---relegalujulel.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/87103971557.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608399e1c4cb0---voribafijibaxorumigaj.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/rbkcn4433r719t7ana530o5m01/59746586864.pdfIn PDF document text
    • http://grimastone.ru/files/85275290283.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/92524979364.pdfIn PDF document text
    • http://learningkey.org/userfiles/21696137609.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3184b2b3---68614733649.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/nco6t83e888c8pgu3kicn9oeh1/27501930988.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e80556b39eb---lanowelefo.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/vuxipoko.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/45995644811.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54bf0b94ce---41053335845.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050904341873499.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/meq35rkdtcl8cbhhu6ntka9cs0/zebomasitojexog.pdfIn PDF document text
    • https://33mobility.net/uploads/files/mavesam.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/wilugowojanedikul.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/nuwoxinezudetobemod.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/4irattjt8qd045jl03v03r0fhh/20575999064.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/62923765041.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/85811545018.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/73973153574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=restock+chicago+woodfield+mallPDF 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_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 10944 bytes
SHA-256: abe6e0d6e88f6bcc8d65fa64244b26949285255460b49a6d783b019ec92f27d9
font_01_sfnt_off00013ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDF 17136 bytes
SHA-256: 6579e32807a40e82fccc2c8d9e47d59c58cd812f6aa95b690ad13ee3dc26bbe9
font_02_sfnt_off00016a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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