Malicious PDF — malware analysis report

Static analysis result for SHA-256 42071edca06a60d6…

MALICIOUS

PDF

74.2 KB Created: 2021-09-19 14:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 316de8ba73146d84752df1327994a681 SHA-1: 9a787794fd630093a9f1ad447465dba2a65789f5 SHA-256: 42071edca06a60d672d2c3349260bf0e83642daf454b1f3719c86f17f9ee71d2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=android+get+my+ip PDF link annotation
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ab6a4308---puxiwababu.pdfIn PDF document text
    • http://househouse.it/userfiles/files/70288841625.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/92162979298.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/48339825813.pdfIn PDF document text
    • https://fuoriscena.eu/file/zetajivotuwawemoxadekuku.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/jilezogakewosidimurafive.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/34951097001.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/vedaworazuvoteliz.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/10323800544.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/bb63a19a95bf5e1be30ee2723e94a0db/60602915037.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210912_1851F112485463BA.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/93856364580.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/79646806292.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/janapukufasipa.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/jejavorexamupakikor.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/78754118031.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141f6f646790---zizenalaxupajijesixepi.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/gudofefazagosole.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614716a86b5d1---75235008800.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/sezorepewi.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/goriruzimuteregimemeg.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/zofezebagomodozunaraduz.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/siremaxojisu.pdfIn PDF document text
    • http://health-bridge.in/upload/file/levog.pdfIn PDF document text
    • https://parc-hotel.info/file/50690159055.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_off0000bf67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF67 16840 bytes
SHA-256: ed2dd80334b7a278842814f728787ef878bbb75cd05bb165b71d0ebc0a93737f
font_01_sfnt_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 10456 bytes
SHA-256: 3c60bf6abdafc8b833fabe2db4db3a3bab3f96e8b7ce55d5365be5462cc325b5