Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf95f3abd6b68b3…

MALICIOUS

PDF

72.8 KB Created: 2021-09-01 06:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 032224a0a4786ec4c6dea55e2ca53a39 SHA-1: 8a600a34ed388f0137bf83eb1bd9e3504fe3c70e SHA-256: 7bf95f3abd6b68b33883e6d13d746dac950f22635e4ca55e04f3b6ad365148e6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://queure.ru/uplcv?utm_term=types+of+embryos PDF link annotation
    • https://sts-cct.com/app/webroot/userfiles/files/76285063034.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/bafikorififad.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/36224700281.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/nadebelo.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/07/27/41658322589.pdfIn PDF document text
    • https://banghenails.com/upload/file/fuxerozemubenonaseme.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/38ac34a3209388a1ad40aa2ee91284d8/jozul.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608760923be08---94226816420.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/lejuki.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/17293160361.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/kogusowuw.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/bavixumapek.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9514d619f---nutitamadipeta.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/lipalaxetozibomo.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/25709322100.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/41122457586.pdfIn PDF document text
    • https://mmszke.hu/files/file/gupadesipabede.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/018d10e465077b5051eaf4da1c44a3da/pubiwuxajigufesopagoveni.pdfIn PDF document text
    • https://keongracun.org/contents//files/nodijofobaseditewarefi.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/tugadubivowugo.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160703fbd08749---56526507935.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/91161083025.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c63655540ed---45391133506.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/89163758964.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_off0000bf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF04 15452 bytes
SHA-256: 63cd5ab4f163939e040565e9646281ff67fc38ec2d4b0c798ae9605822768f51
font_01_sfnt_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 10236 bytes
SHA-256: cfd00a50643fc93cbeb1bbc5c227887c9260d18e2927c556e5fac69e6657a184

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