Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80cd756b82109c5…

MALICIOUS

PDF

100.4 KB Created: 2021-06-28 05:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8e9776857f782a27cb722b87d6ccc765 SHA-1: 635d38ce0223eaae8837b8bd5efeb9f7200c7857 SHA-256: a80cd756b82109c5790cd01b6d77959dd1ab1b936fa4aa47e44351d6f727390c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload locations and disposable hosting sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this document is designed to lead victims to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://krisoc.ru/uplcv?utm_term=cursory+in+a+sentence PDF link annotation
    • http://kibbkw.com/uploads/file/59934277053.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/fiwudot.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/noxaguvo.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/bdcedd17e790011e0958623f51a7f7f7/pominu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0d0c06a48---polulavenur.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160897dd270a02---dipejilubinemajimed.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/sepenafimivafunarajadogu.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/bodigetevazoluv.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e4fa28aad---logekijajugiwetub.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/1e9641789db0dd85efb73b346bf72f05/kujijube.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jqnd4dmehcvsc04dqntda9dhh2/43858274827.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/67009332319.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc51f1d5b9---gapaduvakirumetuxodema.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf10f2652---xiwaxugixeperigi.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b463423f925---93568020779.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/u5gj8hqlkp8r4l937drsj5q3fi/58035015601.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a4545d718---7609890845.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/050e6cfd0b832df46975799a20696f35/43498198909.pdfIn PDF document text
    • https://hirurgija.me//files/kakevobazakufup.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015464.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15464 18604 bytes
SHA-256: c413fc64fae1bfea1244080607ebf0f15ecdb2231b70c1d6ef106c6fd04623ec
font_00_sfnt_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 10424 bytes
SHA-256: b0498681ac9b2e8831a3a4380e8f6a780a7d02f2c81988a641185f39d9a8f0de
font_01_sfnt_off0001006f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 24680 bytes
SHA-256: 7782c713c304c5f72dc507293d3f99171a160df4e3bc8e6a1fc02335494cd3a0
font_02_sfnt_off00013c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00017303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17303 4452 bytes
SHA-256: 6b4c6a7359ed5292c77e2d9f8d9c4546d0c0f3df3145b76727774813f18332aa

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