Malicious PDF — malware analysis report

Static analysis result for SHA-256 5082520f0160f1a1…

MALICIOUS

PDF

96.9 KB Created: 2021-06-09 14:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a6b313363a818572e689374bcf0a4d4 SHA-1: aa15ff912768dff417192a5f1d3908c328ca4bbc SHA-256: 5082520f0160f1a1737280d3d8446ebbf00736feb991528a88ae596dc9abf618
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://philabc.ru/uplcv?utm_term=mod+jurassic+world
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c5cafd1892b5b1b57ce09daad5d25aa5/tibabuturigonularomile.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c57ecdfe---96151135163.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/sepuken.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/1be043c5a99ea98a01c78c0aa27c95c6/jimuxakubut.pdf
    • http://ezibra.pl/upload//file/fijaxudanugopezuwavugame.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607004635e439---18368594752.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e028c8337f---12228208099.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/2850c13170d0b6b4b314e5697e8a47d5/kiviponamerara.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a18580e84423aa2f04ca4da6d670b343/43590483264.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/42146863950.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/303us77ce9ocjd7n6nicv34su0/zoxakufabawiz.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df7eae3e78---genil.pdf
    • https://cleaner.pl/userfiles/file/likidusejukuli.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/0dbd22a4283202aa0c6cf2881d8ccb51/12281623582.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75f2a6a4e7---vigufalu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b3c.bin
1628a493ba67eb2507229a705bd2f90ca995a84abba683655fb64e27a6921195		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3C 5108 bytes
font_01_sfnt_off00013cba.bin
593a452f0795506ac97007ad32b21767cc543cb1bc716fd74108abb5279d52e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBA 6640 bytes
font_02_sfnt_off00014e58.bin
544a73ab00423039260689cb5861c50ea637b29f095766a515303b026c735164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E58 11388 bytes

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