Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89efbe80ee4d82c…

MALICIOUS

PDF

86.1 KB Created: 2021-06-26 01:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7138fd1ccd080d6c06890670e141b3d SHA-1: 8497294732db618c6f5055fd7636c84fe034c7f7 SHA-256: c89efbe80ee4d82c127bdd22b2cabb044dcf8cbc68abb550ba67f569a36e7958
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous distinct hosts and the use of 'utm_term' parameters indicate a strategy to distribute malicious links widely.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070d1587892b---21590838971.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/2f026afb986d33b7688d39d90bae1dd5/93234242256.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/54878ba7aa9423f66a953b9176748fda/77088692889.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc582eeca1---36663930731.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d5e5367b5850a8a412706105984c6939/wegurasalipelumubuwuj.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d62e961990---92371115519.pdf
    • https://zapcdn.space/web/img/podborky/files/guvegopew.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075bebf07e39---63782942045.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/d6f3446eff10a4ef98def5afc0f5cfb0/xojibuxiwakebedexokom.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607536be3159d---89546646690.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0e1112767---6190743715.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160815fadb4830---deluloni.pdf
    • https://anakaygame.com/calisma2/files/uploads/linuxibizumijifovoxera.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607695e695479---74343741182.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090eeeea5f68---55156857561.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/g6agcm2iqs5hp9hf469g1ga636/xuzil.pdf
    • http://remont-etalon.ru/upload/files/84971516935.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/23769854ba3138955e320db555b0c681/xozoxopabimureta.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5d351521---zitegijexizofodefonopo.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c1974d68ce2c622c7048beee3d051b58/89667718674.pdf
    • https://jagominum.com/contents//files/kiwux.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/874373ad3b9b679c03fb2fda2d43c75b/90635947322.pdf
    • http://deurenhanger.nl/userfiles/file/7803384012.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57a6ad0f74---nifuzavujazezomawikaxix.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+bail+in+law
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f130.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 16792 bytes
font_01_sfnt_off00010942.bin
6155166acabd26e264650ada52b105fc9b9059b599349f59d1d4c2b36b06ef07
pdf-font-stream PDF embedded font (sfnt) at offset 0x10942 16656 bytes
font_02_sfnt_off000134ad.bin
98bde33a5262d6d22d2c866858164c9452cbb74787dc21185d0b76e701265680
pdf-font-stream PDF embedded font (sfnt) at offset 0x134AD 10072 bytes