Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c8c85befaf4098…

MALICIOUS

PDF

111.5 KB Created: 2021-07-30 17:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bccf625e67201ba3c680638a79e97519 SHA-1: c8f8035efe23ad97c9f2a004d2df27c42569a0c6 SHA-256: 87c8c85befaf4098128e9e8f75866a0d4a8018e9376bd5f48243f6ea2983358a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous distinct hosts and the use of disposable hosting indicate a tactic to obscure the ultimate destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/t35fjvnjlrvd7ddmb01t7l8f97/32952880932.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a3c012b5c7f549f68b04e6019a68c123/88388944289.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/wevidafovulujizemekeroj.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/1f206eddc8d8a4765762b076a627f3f2/66892407710.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ou1m54tpcfk54r3ubmn86njbp4/22222645177.pdfIn PDF document text
    • http://kezheng.net/Upload/file/zudimebalumiza.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/fetezoliladimenuze.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088e27ac85eb---goxifivepomevetewabisopiw.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a779f2035e7---76125420552.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/91364018699.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b9ab590b0---70754472587.pdfIn PDF document text
    • http://strandedtattoo.net/file/4138176093.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/7129072328.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/dcd00a81d237a8e7a9cf0bdb7c866011/dojevubebulukizeniwik.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/lowudoli.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/dagebig.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fe69753a9---titixad.pdfIn PDF document text
    • https://nada70.org/userfiles/file/28642138458.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/30077781770.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/dvta9ig7ilja59ba7vjhlt7deh/76533503444.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd98e3d9b---lapizejilenapulufina.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/80369832bee50aca28c160e0297cb18e/dodefegitalan.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f7363f899b054093c8b6ed5d5037cf65/xixojekimeneletonugeput.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/wukefuliwag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=my+hero+academia+season+3+opening+2+lyricsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off000194ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x194FF 16836 bytes
SHA-256: 200686e5cae5a04270f0e543ac38f0a4209c9c90ee8b5ee67339f7c07bdbcddb
font_00_sfnt_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 27208 bytes
SHA-256: a9c5015f449569c73601bd9474283f080afa3492da5ca081097696ea70eaf41c
font_01_sfnt_off00013788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13788 16716 bytes
SHA-256: 1c1ddf3204a92f2da33488236b41ec2db2d6800d99e807e040d4096b72752fd4
font_02_sfnt_off000162d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE9 11264 bytes
SHA-256: 365e427c9e043a9d5a9a72870025e95907ff06d9bf55b9e055fdcdb33902808f

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