Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bf143f08b4aa4d…

MALICIOUS

PDF

90.2 KB Created: 2021-06-29 05:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f4f241e29696d61869fbefddc2483324 SHA-1: 0bb21186a6f07c5e54cb8de434ac76ce7151b520 SHA-256: 09bf143f08b4aa4dba5044ec810f85b465c1250b5846732a7401cb363ab6e898
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and disposable domains, likely to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/tul2n1u6q47gla0o7iu1q9b274/49159702771.pdf In PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/sedojunitawuzovususoj.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rv1035ggena8t6ql1vpqpndqe0/vubotawamize.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd4bc1c4a1---wikatapojopusutipole.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ce3052b6b---kudaboxabokowijaror.pdfIn PDF document text
    • https://tangente-mag.com/img/file/33714045694.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/xojixazijepafamufazobiku.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987875171d8---34439029794.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/42444957988.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1284808dd---48078291225.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091abd7ce72a---gufem.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/96044075806.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ba33f9a9802---xavikobazixazuwopeget.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/63992051607.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c6ab1a551db28192a5670b8bae8349c9/juladibep.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/nokonolabi.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b43126a9660d1c1aba2ad33fd0d2488c/jevudovasujederekitese.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/kodijaxomodin.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/sedidag.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074260d4ea0a---51092215006.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/74419429006.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/n6q5lgj72gpmn8vm287q07opnn/8148804294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+draw+two+girls+holding+handsPDF 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_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 16480 bytes
SHA-256: f1d940b2ab9ff85f2deab49caadc5a5e7f7d916b0a1016972d86ee187bb175e9
font_01_sfnt_off00010069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 16584 bytes
SHA-256: fb24e706cae6e154eeff5574bba733a93b1ee29bbf6954083c6306a2b6760fac
font_02_sfnt_off00012bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCA 10472 bytes
SHA-256: 90cdc7f0a001798f03ee8f3b86377fd48b4f9e9e38a69a4325117f00e497bee5
font_03_sfnt_off00014342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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