Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a01093bdb8a371…

MALICIOUS

PDF

90.1 KB Created: 2021-07-22 11:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6ca2dc5957abc7f24c1324ee5d97375f SHA-1: 670949820e4c4180716ee3bb3fe6ac87058c8b1c SHA-256: a2a01093bdb8a3710e1f5fc1f66af4d7cd9ac9641a87ad930777f2d897771906
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains a large number of links pointing to compromised websites, indicating a link farm designed to distribute malicious content or lead users to phishing sites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae5332d33---67325650417.pdf In PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/5lch1doiafp5tj6tim2scm8eh0/fesasevanitasazama.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/cvj3saq3mdsfvcdu8arg3l4eon/lomugegovisogutupufekez.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908e52e463d---siwumevoniganopadel.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93fbba8b81---57049250874.pdfIn PDF document text
    • http://placc.info/up_image/745391168.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c988ed18c0c---18103168734.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/kinakotesexaniloz.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f681643986---padijapivaxenu.pdfIn PDF document text
    • https://sanidom.pl/img/file/14111410977.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/675297678.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/valufopevut.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/86294719197.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be2769a1787---2536681223.pdfIn PDF document text
    • https://ahha.az/userfiles/file/72070403980.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/60713628207.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/momezipuja.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ada7744b4e1525a261324b86c78540b4/xevofenalup.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210504132802.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/bowemofu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad576ab665a---57526935811.pdfIn PDF document text
    • http://midel.me/userfiles/file/640879759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hope+it%27s+a+good+onePDF 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_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 17560 bytes
SHA-256: 94482900c8f8eae6bbda928896f6016732ac1964b7680bc25d366e797f2af92e
font_01_sfnt_off0001288b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A2 10448 bytes
SHA-256: 91c3fca68d72b0c5c3185f1f595570149efcc885837c43d3101ad2d7cee816c0

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