Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0b01fd36ebee19…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 10:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 58675ff0d2851376cc704079ed9b5c85 SHA-1: 42b524ec4db1a4294b48d00d7551a58713224a57 SHA-256: 4e0b01fd36ebee1981732b4bdfefcfff9f44c0f6bc71113e29f3dcf368ed9871
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and compromised CMS uploads suggests an attempt to obscure the ultimate destination and leverage existing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=minority+loan+application+form+pdf PDF link annotation
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/10c4c1aa851966117365c684c0fb1e61/nasovadavupawenonemevupa.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/takuguwotuvorizukegi.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/5369317222.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/pt0gp7r1akmn8vjkd9v3iknd00/jujexerumago.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/0ed16632526f2d800e58f6a76685bb28/rupufujikuruvuni.pdfIn PDF document text
    • http://e-sportis.com/images/upload/59361053307.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/77828908333.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/30665278311.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/84416679273.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/fimodoxafowoge.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/21292600331.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210822_E3F29C7770A52F51.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/rusuzenakibixerodowekuru.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1be1ce781---regokesibob.pdfIn PDF document text
    • https://daismene.it/file/45630026143.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/37e76bfa38649a51ed26a0bd4577725f/mapijimudexamuxemivo.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/29526871149.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160737002b1618---11865029359.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/7396509149.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-08-19/fe795c1aa74d4e9a850ffd3463ec6a0f.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/61769174210.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/249c6ec07c8b09d518ff8111b445f94f/96704241105.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/91qiiem8m4oblbgq5sqcf5si3b/45069906491.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/topubikaxapesalunoxev.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a1ac0191bf9d899d69b2f2f35da48b53/86364198461.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_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 16988 bytes
SHA-256: d42057b0e99537e116423fabd13a26188c0efb3345c529fca6c4d8b41061d55a
font_01_sfnt_off00010b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 10588 bytes
SHA-256: 49b604d34e808011490a03d5842b98df2e0ea61dd6622ff0f30f774df62b62c7
font_02_sfnt_off0001235d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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