Malicious PDF — malware analysis report

Static analysis result for SHA-256 6077ba52ade744b9…

MALICIOUS

PDF

86.0 KB Created: 2021-08-07 22:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4e5988bec782b380f9180617f3580dfc SHA-1: fdc87c02b3df2dbc56d3ae280592bd22f392f1e2 SHA-256: 6077ba52ade744b9904c4b064a7fcc467ac3db0670f6d370ede7c6b976a900a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are part of link farms hosted on compromised CMS uploads or disposable hosting. One URL, 'https://queure.ru/uplcv?utm_term=how+to+draw+a+blanket+on+someone', appears to be a redirector. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://queure.ru/uplcv?utm_term=how+to+draw+a+blanket+on+someone PDF link annotation
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/4d3427ced012c58b19414e13316ee725/8376558761.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b800c478429---ronagame.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d290572e8---nizelugabuwisezad.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d2df18e82---figimipadorufidub.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/ziguxil.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b892d40d4---poludixadiwis.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e11641653c2---33062730763.pdfIn PDF document text
    • https://congchungnguyenlieu.com/uploads/files/4458027177.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/89tpa5j0gacujd49mtr4p5mps4/zerigulenog.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/8fob4iprhovhecjvh61o9hl45n/dotokunezilep.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/qkpn76t961mg8tvnng6au9epl6/dugojewanasu.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/zuvafitupu.pdfIn PDF document text
    • https://fallsplat.se/file/4842435532.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/13586883651.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/96503073570.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xopijefilazopef.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/4387620300.pdfIn PDF document text
    • https://securitydm.com/slicice/file/gosigemem.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608977dccfd7b---lopujab.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e27c1234f2---gogexamizedaxod.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/wezimasida.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-26/20210626002148951197.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/wubixitevuvulabogulewixaz.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce98af01df---38486597252.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210802034610_vevwb9.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/3nffqkip5cuki7ob3bk1d80j67/gomawibimafijiwipa.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 10628 bytes
SHA-256: 57fb4fea776daa09da66a673e27b6ce4a9e03900b37737f28a72e87be52f61fe
font_02_sfnt_off00011d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D92 16920 bytes
SHA-256: b84dfcea6edef52eb60f2f412a67ef6622900da102f5a144159d597a8955d8b1