Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16e040d5442ef8a…

MALICIOUS

PDF

67.9 KB Created: 2021-09-13 17:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66d5a8756c46597c256df4bcbd77f656 SHA-1: c26d64e06df7246358640d4cc166288761b21cac SHA-256: c16e040d5442ef8ae313a5a56fa0fa51f21fe96da2b7eab3db73b2c5394c1afa
176 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, directing users to various URLs, likely for downloading further malicious content. The document body is heavily obfuscated, but the presence of numerous external URIs and the 'PDF_IMAGE_LURE' heuristic suggest a deceptive tactic to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.moyekolodin.com/files/tavepubojuxo.pdf In PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd9225c97---zikukisafosidi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f1b49a8fb---21055476763.pdfIn PDF document text
    • https://asken.as/bilder/file/bisevizu.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/wemejevosogumapelat.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/rogatudu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9d13865f---fumisirimobozak.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161373a5d21fec---xodegumutakejudok.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/penuzozumaj.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/jodidisa.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/74281184097.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/sogasaxu.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/domefufojukat.pdfIn PDF document text
    • http://upakuika.com/img/file/gunusulisor.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/vebedomukiziloxet.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/84490072580.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/73662709869.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b38dd7853c---95545739824.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/towopil.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/28124088793.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/ruzotakubitunaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+human+fall+flat+apkPDF 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_off0000b04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04B 13700 bytes
SHA-256: a970f852160d482ea1366551fcabf4d3e027a246cd6404ae02f067da2efe5b2d
font_01_sfnt_off0000d1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 10552 bytes
SHA-256: fbf9e55b31d0884e1976af34de96596f411dd4f99c1d3c57f366885e20d8b97e
font_02_sfnt_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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