Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a281c56215b61c1…

MALICIOUS

PDF

177.8 KB Created: 2021-07-01 21:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6c08cf60952daec4d02a8a628bbbe9de SHA-1: 7c1bf4abe36e1bf3430a8db59a9d81b6b01ef5b8 SHA-256: 4a281c56215b61c1087939291f9765a9815df0d5d5ba30d35e8e730b62ec3e9b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely to host malicious content or redirect users to phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a4ceb4034---tomiginazumixek.pdf In PDF document text
    • http://abc-tel.ru/data/File/68046988285.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba32189ff---gifiwisujededul.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/500ba47f9e5118713ea0981ab0a41f15/kixul.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5db4f96cc79416d253ca8dd380bfef19/rejadasixawojujubo.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/8535d0f1cdda8dbf379d9b25aa850100/17395161673.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/73a2ed8aa3807deb7d59150bf2b75671/39861421305.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b0079e5a47f---58206776066.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3729953c1---56450584129.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa48d52783---13315792886.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18830211a---10278954493.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2ee2474604930208dfc09149da02eca7/sozewugigopunod.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/06c43ba92fa458d9a2f644359cd57fd5/74240153487.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed353714a7---76263910756.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/52992841669.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/6264baa07332077fe45f7edf4eb155c2/ribulibixutizavi.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090df58cdae3---lomoxofebusawa.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/jidifigotovaxigefilizu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7880e71864---vijamu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cb4ba2e52---71340745914.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607276c0e1fcc---zoguxerutefedipon.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/52374d72095b7f3640a62518d920e1fe/68199613545.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/puvubomi.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/8feaab8809ee3f19d47b9a5923261c0c/37665008037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=powers+of+imaginary+numbers+chartPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000228f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x228F1 25200 bytes
SHA-256: 8671a594d8fa67ba171978a57d77ce1b61b5cddd6bb371a9848b778faae78d94
font_01_sfnt_off00026af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26AF6 11180 bytes
SHA-256: 08ea3ecb823519ed276caeb9062826fd6c43f8d41bf5d30b794262b5f8bf4c76
font_02_sfnt_off00028517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00029d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29D28 17324 bytes
SHA-256: c84868fca49ad2fd08281c2db0e4067300a8e70785bc6b58c2ce6bfb8f4c1c09

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