Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8af8c2c0369337…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 22:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c81316a2d03b677b705fc07da058408 SHA-1: 8d4191849766b2b8e59cf2aa2a00be53bdd6673f SHA-256: 6e8af8c2c036933758f13adee9ead83b64aa0a31d48b8a091caf0a6a84845dcc
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. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting it's used to redirect users to malicious content. The embedded URLs, such as 'https://laborke.ru/uplcv?utm_term=del+toro+electrical+engineering+fundamentals+pdf+download', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=del+toro+electrical+engineering+fundamentals+pdf+download PDF link annotation
    • http://anaminfo.com/attachfile/file/sofufonuwawividuxomid.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0dc4a31381---42921860768.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/33786336070.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/xidixaxedov.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/430a0250d28240d6a9d99555965e8401/zagaso.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/bff46dc5cee2133569fcea7c7805a918/wowajezuweno.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/vasemafavobiguxulal.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093b364c28dc---25740859825.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e81069dc133---dapixulifudejupe.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/ea1ad81175ae66e213c7edd00bcc00ee/revajudimarolur.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/d8f7c3569b8b71d9403c27c00d62763b/filedilugupajejoxeros.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/60383516789.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/38ab632e66147bf4520e24003137835f/futatorasebu.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/widazazumixalazatisutul.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1626344400.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/ralojawikizozotaru.pdfIn PDF document text
    • http://termocity.by/pics/files/61780756677.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c8eca5bb2a595740f6ed618383360658/garadunapize.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfd271b6ac---25887936007.pdfIn PDF document text
    • http://winso.tw/userfiles/file/vajigamuzirisuxamakife.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/bg85v7ivk1oitd6dd7edahoj02/89784568733.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e7b33ff788c262fde89a63bc212bee85/93007402363.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3749b540c7f8c2ecbacaa21eb4334085/nagixonuvirelu.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/kasosolenekujuz.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210630_E325A82108699D2A.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_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 11152 bytes
SHA-256: 80eb25aa0d9068476994405dc391e89a27d92d153b70d5d62da91224406da4a7
font_02_sfnt_off000108d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 17232 bytes
SHA-256: fc3edfdc94db2ec7d2f82b6abdcc3e5b171ebf68175b80a94eedcb2935bbc3e9

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