Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5e35690cf0c83b…

MALICIOUS

PDF

88.5 KB Created: 2021-08-03 09:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fcb37db25830ddab3e494bf1852b995c SHA-1: 8ff2e59e9b0d49aa49db69910e4df78b086b3ffb SHA-256: 7a5e35690cf0c83b87012e983a1857a21c489af18ffdf280eb4c89b9151c7fc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content or phishing pages. The file's structure and the presence of link farms indicate a deliberate attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=suits+season+4+episode+14+guest+star PDF link annotation
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be41cac9ae6---tegojofesibuz.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/71711958687.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd847eb2019---serefodopir.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/699b2138c35d83973a0e31fd27ae6df1/pekiwapumukemaso.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cb1e3e1dc---tovotewe.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/53685197865.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb85b47fe0---67995293090.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/84207134431.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/48569997757.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160893372d957b---wamifosejol.pdfIn PDF document text
    • http://epsilonsigorta.com/files/6820925250.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/koledomupov.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/05c65e987737328248068c3fdd9f9022/wonifarorofurosetafawuvo.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/zewebusisaxojufederezejub.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cea42ba7ec---82399504365.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/movuvi.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcdc5b2c0b---xagatedakurudawite.pdfIn PDF document text
    • https://estoniapools.com/contents//files/51394375164.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/jodedisonewiboj.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/83864522052.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/066fecde0b418ab3acab0b5d969b3346/junevatilagafizumigukax.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b128c71128e---51652056016.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/01eb52c62ce7f6f9f528210057fc86e6/dinigajukovojef.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_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 10824 bytes
SHA-256: 1b10286d364d53c278a580086193c8d87f49cba4bacf14e4c712d20b28954939
font_02_sfnt_off000123d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D0 17968 bytes
SHA-256: d2145ed8f046db1afe15d498f5bc7720dd4a1f0aea6c4ee1dd860c0be791705d

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