Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc9972e346060d9…

MALICIOUS

PDF

71.2 KB Created: 2021-07-03 17:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 22b53569c29e0cfb503391b7c8980c7e SHA-1: 28a103ad5e895341027e82436a98739d85309490 SHA-256: 8cc9972e346060d90f2e78fa8d13e7976220258e8198efbb051155d9bc84f872
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload directories, which in turn host other PDF files. This suggests a multi-stage attack where the initial PDF acts as a lure or dropper for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c284521a0---67153963599.pdf In PDF document text
    • http://writtenmail.com/upload_images/file/6905606953.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/4676cb8b00f9fa905b1dfca7981319af/81866092681.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8ebfb73a574c95dc075f5fd6c6dfa09e/88969527971.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/b0g908ao0lk0k75nrvrt4kfskp/xitonubosibex.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/lnhrbcsovgv56t617g1f18pjh0/damobekibogul.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608804f2bee4c---73084333935.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/8dca3e4abe929892306083767b3aab77/42345789431.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/odul4g36jpn5ihbn8ifej06rc2/lenoliridadarutanoke.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608648d62ad27---sunore.pdfIn PDF document text
    • https://buka.ru/sadm_files/vudavuxoxinabopilekibabe.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/gobibagapabobusu.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/emukv8ja875h3o1rgp8tfc7a45/devetufojolaweri.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/5a146d32b2941b8a0735948b61798884/84360905839.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160988632a9f09---43197175814.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/0126abf7b9c29e28806b02372d3720c9/zitukubeduvijazej.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/c85045fcda9c5d416c933c42fe96176b/mafedalagugutebibux.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae8be59c4---41145703324.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/63222323237.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/59ur5p419sabp0uv2cbsglqiin/nukazoladojow.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///18274241799.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/nifomubixavinitodowigisug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=singing+in+front+of+friendsPDF 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_off0000b639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB639 16224 bytes
SHA-256: ba6f1d088f6442feda8eb51e93e83e83efdb08dc1fa308b69a1367208d7aa852
font_01_sfnt_off0000e009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 10396 bytes
SHA-256: e24e761d5436e3f6677bea86035b9dd6e27424da6a544633d81cf7b002e0f63a

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