Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68ace715d9e1c89…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 23:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3087102fdf10a078bf9ddce452856c15 SHA-1: 27fd595b4ad4b17e6d5e253e8a699790504ea4d3 SHA-256: d68ace715d9e1c894c169a8f6231531fb07d9b308007c4a1640c97a0932ccaa7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The document body is unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=logos+all+answers PDF link annotation
    • http://biogenetec.tw/image/files/20210723_012138.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a87361e5a---famexalulepej.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/napinivinukanesavejaronu.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/vinufixeremonurexodimone.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/nelifenetoz.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/542df558317d586c922da1a566b2d7a2/bekerubimu.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/jarer.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/daxonuvoz.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__611CE7B42B086.pdfIn PDF document text
    • http://devison-matras.com/upload/file/gupop.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/2mpmmvb6m2j8otnl18kun2ngd7/70568812657.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/43944526045.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/moxolujalexapudaku.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a32e657e576---48758856074.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f10049a4117---80342603552.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/luwanofudebimuwuna.pdfIn PDF document text
    • http://keramann.ru/uploads/files/molekolilufurewatupe.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609422670664a---5414758682.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/61494332190.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/lotixulorelasakawitoraw.pdfIn PDF document text
    • https://bagstyle.uz/images/file/97252727002.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/rufoxovifu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/riegbsv94k3ovinmelo8tuhq2f/53975176063.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_off0000dbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 10136 bytes
SHA-256: a8fe464c2ebbdfabcdee56cf2fc1685409832e467f123c93e407e8172d02be89
font_02_sfnt_off00010a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 17684 bytes
SHA-256: 1c8ff54161048092660b4fba2f02ead971cafed0adf5455cfd166ed335914f3e

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