Malicious PDF — malware analysis report

Static analysis result for SHA-256 09276a900f1eca0a…

MALICIOUS

PDF

86.1 KB Created: 2021-08-02 05:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4f324645e8f4b809a0f849435509afd SHA-1: c3afcc77aaaa88528182be9108a5d82504d70fe1 SHA-256: 09276a900f1eca0afdfaf67f0e992617891d6632d4ecb6795226c3f10ac222db
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a390e3ddba86f586392ac72a6c8a34ec/buropavepuz.pdf In PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081bbc385c16---nenajenetolesad.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/82f6f1cqm47ip1601i41h9nl8j/45523364056.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae83cbeedf1---3726223815.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/gejedigulitoxa.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/tamazakofazupexoba.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/82a59d822c629c81f7532b077c048a08/zugugib.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8d345e2e0fe37f8673b6d4a99a0a40d3/motebupof.pdfIn PDF document text
    • http://planbmedia.hufiles/lapukopibinij.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/11833127018.pdfIn PDF document text
    • http://ubest.ru/images/file/17971227046.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/2dv0hh5fir3do672d7j84eqio7/73965263111.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3978ca58cfa7f1fd71f8ea3141cf4587/67018226869.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/4kcea6dlgik2306mlimtnq5m1u/kinufezaxebiwekabubi.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/tubukelosexakojonab.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd81100584---kowon.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/xebavut.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/30436538929.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b38605e55c8d51aa030ef3bcd1d2ca37/99337304793.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092af5da7e29---58994337880.pdfIn PDF document text
    • https://soechi.com/userfiles/file/45609260711.pdfIn PDF document text
    • http://www.heksan.com.pl/file/9324456754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+reset+the+time+on+an+armitron+watchPDF 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_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 16684 bytes
SHA-256: 85c87dd5d74f5180f708a8afa697e566ffc70a3a29b68b3bcc9b7508d54a4a68
font_01_sfnt_off00011927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001313e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313E 10524 bytes
SHA-256: 9356a75ab1fc612e788c30d67a63514a1bee18440e1b3ea46d959c2c09dda832

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