Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa08dcaffc7d8e5…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 07:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c55710ad59e4ffb2ccefc31b66c8c54c SHA-1: c779e90541b4d36b8f0f104617321cefa93f0252 SHA-256: 2aa08dcaffc7d8e565a0c9021d9673ac169d79fc645d537900deefa6858c7d68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to external websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the overall structure indicate an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=the+handsomest+drowned+man+in+the+world+worksheet PDF link annotation
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/77135990157.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7b45e4f7b---12818018595.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a847f216896---31949099697.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/50599007269.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/affc0186f6fd156ef5fb24ba713293c8/16433003333.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161286fb7d24bc---vuvexafidit.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/42268381601.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/56271925951.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608441c89d653---zoterufojow.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/jimumidoval.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/vakibekilivesuzi.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/92028629689.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf731c73d03---dabamolik.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cae6bd880---luduxiko.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/xufogopamuxofekudusoxadil.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/57512485379.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2df086ca2b3d0184adc8e723f02b2736/zunolula.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ed2baa9f8---38434908699.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/45726037161.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f930c3983bd0ee3ff7d8fd7123046fc2/bixosotudaduden.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a615c42c6d---14974543310.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/53510722812.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b70e0e7f439---35689851353.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/zokupawobevini.pdfIn PDF document text
    • 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_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 17716 bytes
SHA-256: ebf11a9dbf8e17139778bbe39d99714dc3cdecbc3427e0813cbcb862e5951572
font_01_sfnt_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 10652 bytes
SHA-256: b13c481a49de05882029c61f27ffd5f986ac871c930e48a6b7390287b7bf7389