Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e8dc4fea260914…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 20:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfacf1448be0e871eab719f13c1f160f SHA-1: 0fc3a2355ac22a3188f46cb220e2e7cbbbff8399 SHA-256: a7e8dc4fea2609146dbd6749472d8a22fcac7666a93784820a493a636de0a7b6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Numerous heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress uploads and other disposable hosting sites. The embedded URLs, such as 'https://krisoc.ru/uplcv?utm_term=how+to+get+free+episode+gems+without+human+verification', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=how+to+get+free+episode+gems+without+human+verification PDF link annotation
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/sikljsr8qa1tnme2u9ja3s2hpd/29843443606.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/95529108950.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/31038233738.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/diriludemojexiwi.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/48816055927.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/8419292598.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/82865469267.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613efb8edf59d---dawewubofaselepaku.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/rorapi.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/kafex.pdfIn PDF document text
    • http://hybsch.it/upload/file/wofapisuzurojadazegin.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/xodunufit.pdfIn PDF document text
    • http://dsverano.com/UserFiles/File/22301939268.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/75069917240.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16139db4956442---30338793571.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614029997ebdf---zexijuwopemax.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/ab66e4f63d5ed89c4ae77976526a1223/kujimuwada.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/74884206864.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/kosenibifaze.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/sosaduruwepupob.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210910020713.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210902010825.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b39c3f21c5---xejegawosekem.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/40640318284.pdfIn PDF document text
    • http://njxinbell.com/upload/files/sikevuw.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/kotufirixetudup.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_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 11264 bytes
SHA-256: e3fa0648da23b2f75419740a828e087086f144bd9bb68a6c58451220dea5f9b1
font_01_sfnt_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 18312 bytes
SHA-256: ad9175fe86edacb36f663e11bbb2ac61cef9a46b9f09063c5780bca11188c643

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