Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e56d17b4ce623f…

MALICIOUS

PDF

79.8 KB Created: 2021-08-14 04:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aca70434a9f53dac671af058a2ce0e60 SHA-1: fb928d45d3b8e3c81ad9749e5b643b53edce6f81 SHA-256: 15e56d17b4ce623f4546564ab4b8d1f042d07af368c47aecf50c8f47c264a639
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ik8oetj2l6fq25guihus3h1ac0/71327077286.pdf In PDF document text
    • http://omonetach.pl/foto/ilustracje/file/duzazes.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/18gjg96hegmbe4v713p25irrm9/fukuni.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/nalimekofera.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/damirusizunigesoniwizib.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/124239f1292306bf7d9ddcb3a0824e37/94078340392.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/vojapafunusofoxazi.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/52433322264.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/snuaoqrf2ejt7ikqgkg5g66e28/24617676459.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160d73f408dfbf---sovudokolune.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13e1c16fc8---27412672233.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/zetogexijotixakekut.pdfIn PDF document text
    • http://szpk.hu/_user/file/darasid.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/19561816731.pdfIn PDF document text
    • http://chamdure.com/DATA/files/97820457198.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/disavakipegijuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=self+awareness+assessment+questionnaire+pdfPDF 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_off0000d03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03E 11064 bytes
SHA-256: 0932e8715c6ef94cdf295964cbb251e34a561a540b3b2ae3d39ae74fee29b264
font_01_sfnt_off0000e9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D2 17500 bytes
SHA-256: a75ded354679143ccdbfbcf2f05988677203dbea7db57000c93c0cc6caa86a6c
font_02_sfnt_off00011720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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