Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2fcfa4599ffcf0…

MALICIOUS

PDF

94.6 KB Created: 2021-08-14 03:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac65ca6a115b5662c1563c0dc1bc7439 SHA-1: 774afaf4b628a4365f3ad071ce8097ecaea5f1e1 SHA-256: 8f2fcfa4599ffcf0c88325dae23233dab8113c595e299f7edb0a6647c4a67ae6
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to domains that appear to be compromised or disposable, suggesting an attempt to distribute phishing content or further malware. The PDF structure itself does not contain readable content, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vokiralapajav.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/689vpa22ha66vuh2cong8her1f/47314248804.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67bf49ebdd---gulagasifidudin.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8d8555ae---tebigado.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/fulekapevotipuw.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/xexik.pdfIn PDF document text
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/bedavixov.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/7e13cf2e79e58f8233c163bf35c756d8/9880575528.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ca5bb8490b609ae0ec1830d02e9e17a0/danezusanunitijo.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/83f2dc987cfb21d30825afd6c60f1d77/divilazigekefi.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/122b98b2dee90036d2d8f7df283c091b/74900111785.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c92e7442e5d---53556556410.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/dewageme.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac38e7d12c8---xiluginovakirijawibe.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/55440008712.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/72847482724.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae8cc58b03---tabaf.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753c1cf34dc---75503363412.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/mogadi.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/7794435562.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/movogomerulubodulavurub.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/649019ab80f37482db29df08771b75e1/rozivivajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=priere+catholique+traditionnelle+du+soirPDF 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_off00010ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EE 10712 bytes
SHA-256: d9170c1deac8c6937f11a101cc9f86a4cf28b71b1b22df5bbd130b255faff700
font_02_sfnt_off00013b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3A 19308 bytes
SHA-256: b967fe4c1478bb365c3cf3790f26521446f45536c091fdd3d96a3bfbd383e734

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