Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d70fa58d6245c18…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 09:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d1d2aba59808895938e8406aaa71bcf SHA-1: 415e38fef22e17b985db51322589e82634e7dc16 SHA-256: 6d70fa58d6245c18ad2c70e6999779662a0bd4a5a263c143cc70b27a7686d3d3
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 WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=assassin%27s+creed+odyssey+silver+mine+cultist+clue PDF link annotation
    • https://tiguan-wiki.ru/file/72098509387.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/76987469519.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607695c539206---55361678144.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/zizafeve.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075da951b8ea---tafasapubamujasetewafoji.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777f6883b6b---gotet.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/43353552258.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609481b0510b2---48725308802.pdfIn PDF document text
    • http://le383.com/uploads/files/diwowubudap.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ec16f0274---13882706651.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/eecd4d6986ce07ec1f5a8ab4e96b7286.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae90cfcde99---84957402822.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f84b251954e---zugivivonado.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4e4f8d3bd27931f9a088263c3f98d98a/burodowiwij.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-23/20210823180022142197.pdfIn PDF document text
    • http://360mart.net/uploads/files/wumedijojuloz.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a6b2bc4d0---78317539545.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///72517601139.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/gefebuwuguvusofakepede.pdfIn PDF document text
    • http://whatdwellswithin.com/file/99546207911.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/14118270518.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ak0253tvnp00phsf1l3mhuv1bl/51206347974.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/79513672682.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 18028 bytes
SHA-256: 34fc066a1b0eb2fc674c1b36bb155aa93de852d8de4002efd82ed2c8171b92c4
font_01_sfnt_off00010b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001234e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234E 10824 bytes
SHA-256: 77f16f1cc7a18e17a8498d1e4ef072ce69e4fcbbdf251c886a8c4f87677392eb

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