Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb592fb3af623c7…

MALICIOUS

PDF

97.2 KB Created: 2021-09-06 20:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d749c5da78b627bb897453b741dd0255 SHA-1: 273e83e32d248fe43bad8101883410670ae438c6 SHA-256: fbb592fb3af623c7e8b43150e0ca7a8d02f898e3e04686125f18e98cdef67cb6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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 http://mh-gartengestaltung.de/userfiles/file/butijuj.pdf In PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/xumuwagoxirezepad.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/benew.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0571a205b---vukuguvipidize.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e89d853404ca9aa5ed53797857ba24c/sarixonosunobumikepaj.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/vojoxadulewopabukowoke.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/mejonokumimomelalujeg.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621213273.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/mobevajazidadatos.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/78003909000.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/54353541368.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/64d04ca14d0b6441f2cc040d7ebe3db9/pubapogoru.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/82170992479.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/84558645391.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gbnhc1942ifiiskaihuampj655/31160639137.pdfIn PDF document text
    • https://tantecoccole016.it/file/tizobasoz.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///vexeg.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/32984889377.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b8bb5f3932abdc6ef33d199b8a7f4481/1779748213.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d478213e3f912283944445126b87da7a/voxokoxudubax.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3851634fc---bobegumexubufavasulitapag.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/51010787465.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/xabaj.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/jakij.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a231da7b---78145865796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=vaishnava+sandhyavandanam+pdf+in+kannadaPDF link annotation
    • 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
font_00_sfnt_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 23260 bytes
SHA-256: 6313fc49a26e9669728a9d9802f2e52e9a3c7042f88d07de8d63d85d6c4b71a4
font_01_sfnt_off000128bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BF 10508 bytes
SHA-256: f365d935b19173a66b6231356683371647f791d892b7e7158f4e025f3af27494
font_02_sfnt_off00014067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14067 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0001485e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1485E 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_04_sfnt_off00015e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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