Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22e529b5e68a7f3…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 00:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9764b65737ad57183d31ffa5adef6e62 SHA-1: 1687c3149ba0aa8ae4fedaba872069cea6d20cbf SHA-256: a22e529b5e68a7f342cf32e8008825c2a45a09e58450f8fac044171ee6befbf8
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users through a chain of links, likely leading to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c5d9d7e5b175a4ce066e75834e602755/71311844401.pdf In PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/25352465721.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/29964064608.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c12123c460---migikaloniwodogi.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/8469595798.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/93990488798.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/52196325594.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b27d94e1f40---85142636209.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/newofabevukurofomepomi.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/24230517988.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081353f8c733---tulaxiki.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/88899853828.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/42209580805.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160926a8f321e3---33988071416.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085de09cf904---jebaduxovodamutedu.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609da13452648---witokekesux.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/kozuzumokelekoso.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f0bf5b0cc---kasutevezerotibobo.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/bilub.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/4b40334807996684f01b338b0a08aaf6/kupakewezunolero.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/debikebapiwutepuwat.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/8ae948f136af94588223376465316885/37142711807.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/40742718336.pdfIn PDF document text
    • http://zimmerei-possert.at/safidakulera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=do+a+good+deedPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 9816 bytes
SHA-256: e7a4a6dee032e528feb573fe3cbae415fbe228b16e7766a86dff127897901a1b
font_01_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 17528 bytes
SHA-256: b1c3ede95a5e9aeda2492a750108c86bfee71485061c25f5edf9d169caaaa24c
font_02_sfnt_off00012c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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