Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55c458e35d8379d…

MALICIOUS

PDF

91.5 KB Created: 2021-07-07 21:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0ae0d875aabce39520c074ca7b7afe46 SHA-1: 0f09e676c2eab11644f285d420910d54e1f806c8 SHA-256: a55c458e35d8379d56f7fcbe5b6b5db491d6d3ca105a4899071b7968ffd768dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to WordPress upload directories on various domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the file being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/409fe55ae3e0676cddb1b37023f1c8ca/14520896367.pdf In PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/28409152168.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/48724517612.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/5ac4292d9190a4268191b77b4668432f/29836801983.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/98c2581e849d1221c61513acd41af721/71855009519.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/73566839483.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/zogozajovuv.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/77009431431943e3f97163940f81e982/dajabejutuwotujuraxi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a601549e12---41196789773.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/pimamajixozisiregexewunig.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/ki1mu256k6gn17p2f1l1suiecm/deradoxo.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/xadavufegugunaselidapobin.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ece2fa9c79---29104825038.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf74e9f3b36---jiwijupixodugopegitaziler.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7fed3578---39475612972.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/18139861091.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/89863830096.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/6272807706.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9f2077f2c---dibok.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160720cb246d52---52714666782.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c06a78c9b1c793270eed060ed7882c57/tigusoxipazavuje.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f0ba12dca---31041148481.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/8dfk9utpin61sdmpki4ei4kth7/sowifigaximukororoziku.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e180502d2a8---76621668414.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/pezanuvuvigetevuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+do+different+colored+orbs+meanPDF 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_off0000e9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B5 16368 bytes
SHA-256: 3fd97ad492992e5f285a8ced78c00820170ede8bd6839167352abc437e926855
font_01_sfnt_off000113f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F2 10876 bytes
SHA-256: 0376c3864527e2ee14b62ea43445b8b89381edd36526992fafb55186152a3f84
font_02_sfnt_off00012cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD3 17464 bytes
SHA-256: 3fcd36e7a39c3a2a148b430367488951d355e2ea1215dc4feecf48a60dc4450a
font_03_sfnt_off0001469e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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