Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf78523c790c6b3…

MALICIOUS

PDF

107.0 KB Created: 2021-07-09 04:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1c4b93b1ef929f04c7f069134894662c SHA-1: 6fa2f678acde931d4613b4ca0e66ea07cad24123 SHA-256: 3bf78523c790c6b39da7ffaab024e338a673a31a05008fba78793b74605be722
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, with the latter specifically flagging it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/2760295a26ab34435f40b00e0040f26a/felugirovapava.pdf In PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0fe83ef27---29641054699.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606f129538492---54694966550.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160d543b56f682---58958249333.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/8lep3kagm9dlvf95hdtdn0fb7ph7pa85/rixuwosaxurudiwonabas.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7pqr7od0fm3tr7ksfjn7vk3bt0/giwosikogojur.pdfIn PDF document text
    • https://icbacademy.com/upload/files/61457314058.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d23ec6b0---22056276007.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8bffdf0b6---4473103386.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/laroninoxu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/64098511013.pdfIn PDF document text
    • http://goref.ru/files/file/21543058048.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/9bb0r50lr9k1etia1jes1oefe7/66011919180.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/050e6cfd0b832df46975799a20696f35/43498198909.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/7dee6a6b5b92e7b3c7f46fff2eb1d9ae/gabepalijevudavalitixodi.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/zunowaxijorafefagojuraso.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/cec1f7011028b5995f85f3cd996998ff/lekugixokudofisof.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e02a8b61c5d21ca80dbc2f6106fcd99a/12899650138.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/2985b2146011bfa34709a002fdaca831/26678357913.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811d663caa0---koseludowaze.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/dabcf9840c695ee78f39cff3c4947720/19139041797.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/6847186078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+are+st+thomas+aquinas+5+proofsPDF link annotation
    • 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_off00013d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3B 10952 bytes
SHA-256: 503fb695eefd39daa459b85e0de6a4d6835e63f860a54b10f385dc11418786ad
font_01_sfnt_off00015685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15685 18332 bytes
SHA-256: 4aca41bc152500ca2bcf6765aa1b93803164a0ede4b4fc3f07dcd517ef536aab
font_02_sfnt_off000186b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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