Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bd50422d23a01d…

MALICIOUS

PDF

89.1 KB Created: 2021-07-01 10:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 511a7084916f80c77510e28fc1bf35b1 SHA-1: d492ca538eea78f4855612c4937b962fa9885004 SHA-256: 26bd50422d23a01d51b7ddeb5635139a75d37531a31de9716d991bee561ff5cc
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. It contains numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=hot+yoga+by+me PDF link annotation
    • http://bsbcarpet.com/userfiles/file/febasopulusorezijad.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/69355340385.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/12d860049aa42ec78085d844213bd98c/vabedorozasojizisitaz.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/segaloxibotexipikipedabej.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/204c817c8d56c4505eb56866e3323658/fewed.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/n98bscna6bkpcs5s1mri36rmiv/dirasobawixirazo.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/7340o92g0kke8fhci4tk2m81t3/zusidapunewonefejew.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5598551fa---dexerinibupiduji.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/66799331528.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870037e5637---wudokavidexugebid.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a236b18cbbe---luloledubujurujope.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/pagoferujafivajo.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/r6rgp2q233khi12rvhmm223qo0/12820172456.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2aec281400182d216a06ceea4327d3e1/wowibujikud.pdfIn PDF document text
    • http://roocenter.ru/upload/file/43472363884.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4aa8f2f137---zezeje.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c33f144fe6---94346498016.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/3b1pvmb0ec1e9vjigg2tkl88rt/88740788731.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160998a9541d2d---wuvumola.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a9838f46---30710759471.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/52275309695.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607854333fbf7---zobobujug.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/fokolomexewogujeranoj.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7d7ed321---zotenuxak.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_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 16832 bytes
SHA-256: a9faab52c77c10e38cc0343a8712d4c5c501a978323fc103008509930f3a1f3b
font_01_sfnt_off000128a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B8 10184 bytes
SHA-256: 3a4dee072b14cd77952fb737b188b9fb60b315c2a2263fc2c5d229ceddc0314c

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