Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2b89d3e2c0eb18…

MALICIOUS

PDF

82.1 KB Created: 2021-07-27 06:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7d35291031c2abd0c6f7e356a792a02e SHA-1: e8b0917bf067d7efcaea8cf678e0197862c75960 SHA-256: 6f2b89d3e2c0eb183ae7a11a8970676ec09ac6307faf11a27847c0c8373edaae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075956446768---losuvaku.pdf In PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/demixazuruxu.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/muzukubaxob.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/11600977166.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/67054532238.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/15524951899.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/84fc682b119225f0b24711071bd38867/vibogewiresevog.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe46899e2---datimovobokoribukovamavuk.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/liveroxezamalafuwogiponu.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16084206ee4e09---34283133661.pdfIn PDF document text
    • http://seamacros.com/upload/file/losukatutofejod.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4541e454a---paxeromukewufusuviruwe.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/7e5bdcef1c0e644c0f60d1ddbc966e28/mekasetasoxabe.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/5973364124.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/8e5d04d6a65536acca9916793d17190d/mewulozevuditewoxasuvi.pdfIn PDF document text
    • https://andana.us/files/files/2971741853.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da5204edcdd---57431602415.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5c40a2f65d6b47587e4613499c725ee5/sofizakafolejuvabi.pdfIn PDF document text
    • http://ruresept.ru/files/file/34750084333.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/20499153665.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0489251001620720144.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/wusosajajogesulijezu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f2396113be1---boxumog.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/tirikubujozasu.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/44646819332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=monster+manual+guide+5e+pdf+freePDF 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_off0000da13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA13 17976 bytes
SHA-256: a1c82d46f5a345ab8a1733e9c77b6022ff27345ced098e98718f09d0069b791f
font_01_sfnt_off000107d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEE 11068 bytes
SHA-256: 3ae621093386811201fb9063fe753e05150300eeaad68aaecf7c6d4e74f9af77