Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a606cec15431ce…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 08:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 166d36f2a76f8c4b705e6b880a1ff73b SHA-1: e4fe71c6d4a5ab37f61f639da77c83b3617cb0af SHA-256: 17a606cec15431ce041784b044fb5167cfc4ea408a9a6f8ba9c3cdab0c49b2c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. While no scripts were directly extracted, the PDF structure and link farm indicate an attempt to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f15e71ca---61038221035.pdf In PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8474a4980bd42eee70fa920dbb6683d2/vibuxozupekararaneparax.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1d03f08b3---devojarefekilom.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/lqq9au3dri5bf5fpr1v6d0rlf5/mudebuvagoxufekuxop.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/24673209083.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/bujemiwomovedo.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/43296564768.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe43b2044---51174597536.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021070120311673499.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b891c451920---50246198195.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/72791732828.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/7tq34gas736e6eq7jiev790fe3/72202324729.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03e02500ad---21815559216.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/molunijenokepanini.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/fibemesidovodawu.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/zafilodikasaginup.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/15870024126.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5ums0qc0367rghmncceg7b1mqj/17505764940.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d367eb07ffd---22517291640.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/torevovemafiziwavefasix.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/63166568898.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/bovivuwateduj.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8b2ea478---lutirevupufoxavatigo.pdfIn PDF document text
    • https://umartravel.com/files/bebivanozovezexafew.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/3064763483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=subject+verb+agreement+worksheets+with+answers+for+grade+5PDF 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_off0000c498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 19144 bytes
SHA-256: c0bffaa106eabd4fcfad6640befe1de63381f41001b0c422f6c29a31700e8e35
font_02_sfnt_off00010cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 11700 bytes
SHA-256: 9f7d8782ed394aabfa62dee35f8b843096763b5b539441f9d0417edc7312579c