Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f803bea0eec73bd…

MALICIOUS

PDF

89.7 KB Created: 2021-06-29 16:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e1725347ad85666cb1e7ad5561b2d9c SHA-1: 206fa58fba809577a865b401b79540f217f44dab SHA-256: 7f803bea0eec73bd008b49364c1b8f560a7e0cb0fe0b0e98274a80ad96c94865
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=3+types+of+entrepreneurial+activities
    • https://diedacorporation.net/freesiafiles/file/tobusug.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/94609581000.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8a7b0d7e---11398307109.pdf
    • http://softwarefactory.nl/images/file/tosodule.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/pvcq79ljjlii40m5qk8hkp8cq0/depewiraropimivisir.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c9fb1e21---bazarepid.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ffa8a762---sinefavaxi.pdf
    • https://advance-pack.com/editor_upload/file/81824328892.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c685fb3d3fe---34398117296.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160763ef389c78---mopijobujisivejaweni.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/3c5aa876f6d4c8da54f4d8fc3d5e0245/3371266811.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/d5617db634a9ad57d48a88a2b0291c1d/wejemorofebirosek.pdf
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/28090748541.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/5dih8mjjos3slk55achiu3drr5/79935052811.pdf
    • https://groupunsur4.com/contents//files/reguz.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6378b69088---jolixeligij.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081fd3f38508---gexutamog.pdf
    • https://fanaf.comarticle_ressources/file/77282133194.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6464fab98e7cf23a78dba840352f6eae/41646724787.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/1fa7e35fd173cb0f7e5dde59ab44aa38/gozifejukalinuxuda.pdf
    • http://shipagents.nl/uploadfiles/file/42376294084.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a310c0f757---3293028724.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/7ffd94f39c8fea5f34e292a321877fbe/xuruloxez.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944e1b626ec---62559543432.pdf
    • 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_off0000f8d7.bin
092a2228d5a1ef32f0e55c7e15c27bd2a2c5c58f078a7f9508d2f1c374f52e3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 18204 bytes
font_01_sfnt_off0001281a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1281A 16792 bytes
font_02_sfnt_off00014031.bin
e2666de0cd972a04ed47aae04ede75c8c23e6036f1f38570c18b38c3b617d656
pdf-font-stream PDF embedded font (sfnt) at offset 0x14031 10828 bytes