Malicious PDF — malware analysis report

Static analysis result for SHA-256 8578d3b3e5599a02…

MALICIOUS

PDF

73.9 KB Created: 2021-08-27 23:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0c51f968038151f9ca1d0bfaf457ac8 SHA-1: c2f71bd58f419bf2d214155830a5f0d94b85acea SHA-256: 8578d3b3e5599a0213b9db92cb0662601bc876de81529ae90448052aa9a0800f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=the+past+is+another+country PDF link annotation
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/9b2816ae0952099629b3bd22c7e9e862/mogijopofuzatetuwubufoge.pdfIn PDF document text
    • http://scpt.it/userfiles/files/mukilo.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/32dbc732a22dd2ef2c044e3c40093317/posej.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/86211438014.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/c9shld727v3r2os1ibonijudn7/26101524956.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f44eefe2460---situvixomorixitapofufiw.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/83ddb2b44f4eb09565c0d40e2da897c6/mowitamivulesenemaw.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/29911568173.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/d14009f827248f5cc7e7affe6b64b6d2/ludadogo.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f691f4499a---kuxurajimodokume.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/75316520308.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/110fad3dac9e4ec8a377413ef36bac7e/27505771589.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210709103802.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/86150532627.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b32760b27---82805425710.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/dixevani.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/nigofap.pdfIn PDF document text
    • http://tele-video.ru/upload/files/fesozu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/46pn0f0ekcl43k6a51cmv8nl67/31142853318.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/raup5kc5ots54tbqh2bs20hq92/sagulafevox.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed2b3ecf31---77412534625.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/56724139953.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae95d14510---67366294607.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/nozudopixit.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_off0000c047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC047 10604 bytes
SHA-256: 85343ceff37aed57ee69be2a995dcfa9beecf47c83fa0beaf359059fde8d13ca
font_01_sfnt_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 16376 bytes
SHA-256: a9596f89874f04997e7877aff69b2eff489788415a9ff55ef6440750add35dfd
font_02_sfnt_off00010268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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