Malicious PDF — malware analysis report

Static analysis result for SHA-256 e085c63ab4f64c4e…

MALICIOUS

PDF

95.4 KB Created: 2021-09-01 20:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 705f4f01e409f162106f192913d01563 SHA-1: e7247619f4fc29c344f60fa6c5552b765cd5350c SHA-256: e085c63ab4f64c4ecc60cf92645f3dfd97a3464522078defac463591ac6a6b3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to domains that appear to be compromised or disposable hosting. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the PDF is designed to redirect users to potentially harmful sites. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608293e81f30f---16340294319.pdf In PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f45be33b490---punotupa.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/37241123106.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/69301884128.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/77026345866.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/46381186034.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/30464891486.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c8f7a5c9f1ae2a7e3ce6323fd9eb099/78538661346.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/u0e31d45haai1vimp0g7vdfnps/lafobuwuzevesogupeval.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/jd3gqrjjdh7nht92ocf7vstak6/93095417160.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d473d95ac8---57593572412.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095feacd622e---46637013795.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fe7b37b93ef7b48ba11867e2e3fe5aaf/jurikonuvegumijiveze.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/992c1c7dfc104482de8b40219978a130/lamalijelumopotovod.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/33985502172.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/95637999652.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc7dd2ffc2---wezuvaxu.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/90539899131.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/32075058604.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/jakefosodiriwazira.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/zevedirapob.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/livasasamelagolumuzunufir.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/887731f07b4a623b019408c9d05a04cb/74860740553.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/jafamos.pdfIn PDF document text
    • http://novichiha.ru/pic/file/nozidulenevoxub.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/mudh78j3v2hjja7krqimc3ggj5/depapuputaxam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=etymological+meaning+of+educationPDF 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_off000109a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 10748 bytes
SHA-256: a5d7ef22f95d30c782d95f2b57b6c9658d55d4fc1788bb375b018f4f7d323312
font_01_sfnt_off0001221d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221D 19700 bytes
SHA-256: 6bd556532015588fb2dc828ba7cb27c4cf69fdd5917d68b6263c09bbb867e2dd
font_02_sfnt_off000155fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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