Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bbd27cb1aa686e…

MALICIOUS

PDF

88.2 KB Created: 2021-07-03 23:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2c66d50bf261d4aacddf6d07ce29e56 SHA-1: 8894a5a91c52c422eb87b0c9eea8ec30b2b31c5a SHA-256: c7bbd27cb1aa686ed7e61403c2862a899eabd2ea2bc676772086bcef52a58727
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the link farm implies the PDF is designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e264a4e7---tinotosunazisofegu.pdf In PDF document text
    • https://kovtec.pl/eurostyl/photos/file/navosixuwowisadivagadova.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/givukapegenisixawo.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd858d9a06---bijirexexeve.pdfIn PDF document text
    • http://webursitet.org/Files/file/39421019399.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089385d5b80b---88104921193.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/88d6249146082f1d1e8e0bdacd7efdbc/44334560949.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afccf478697---zegifozix.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/92003714338.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd710cff78---74766360504.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/27406395040.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/32006e3ab714d896d2f15cc28f2ad40a/sikixunujaxedomafobufo.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/93169993642.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b75437e2cc4---wofefifudipomuw.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1849a42a7e---kelarepob.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/mesagejidugepixikorigu.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc9870060917c0b072dc23d2651fc1da/65477268725.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2a7ff77c626d50565080835a38a4c847/nekasagiri.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075876b9f07e---zilaxuna.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/b552b8300737af0e699f2572c6d3f821/rejevotasixobevigaditej.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/19907630025.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/56963556930.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb4f8cfee---20087260022.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607def881fef7---49316053430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=rounders+streaming+vfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD436 20032 bytes
SHA-256: bb3577cd137611d599f80f4a207c8c5e8afba866a68cbc23a270ec7050ee89a8
font_01_sfnt_off0001070b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 17232 bytes
SHA-256: 0470dfd7e2a4baf3b9aaa62a037f3fad100e43c8b8fb613e7d86e02a993da99c
font_02_sfnt_off000120c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000138de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DE 10860 bytes
SHA-256: 92397e526455844e08c923b463ebc00f646bec2ffe34da0df5e9fd828f9e89d0

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