Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b89c6223468fea…

MALICIOUS

PDF

107.2 KB Created: 2021-07-03 11:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dca0d7e3dc2f9286b109fda0f5b6d9a5 SHA-1: 2b4d6eed6dd240346d6f040bc88d9bdac0419c32 SHA-256: c1b89c6223468feaa7050d39c4546760c9c98dd215248a6b08629decee7f5226
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lure users to external sites, likely for phishing or malware delivery.

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 https://crewmak.ru/uplcv?utm_term=regression+testing+plan+template PDF link annotation
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70ebbc6ac5---98385741624.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pigatesulatobuf.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ciq9dhgkqv9j4h6o1af8r6s22s/doruregaz.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/49717751579.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/80053424306.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b479206d4f1---wilibuwutexobu.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/557c4595e29bb9ca9291e900d514d79b/70949730526.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b2fcb081c---biverawuberapakosaja.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/pakazujogez.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b86625b85aac415a89a627881d7df398/xepekatorigatevuke.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/zufawufilirolisag.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/vepiwuxewelo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160de499b60908---46232277212.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/96420431b7eab7f76c481bf55d21ea4a/36754054259.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076f4fc479ab---weludupol.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/d214c2bdef79ad706a76b18dddf5f39d/birilugizusar.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/1f9a643fb781d00d6cb6bbe6626b7ab2/tumerikaropanos.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d56b77919---17505570166.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/15ef1cfb9b12e7fe3afe9e91912224f5/joripev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609467032e47a---58959295734.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/978501d365c5f554cbcc29bbef29dca5/golisuletemukesifel.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/2528143818.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/gujb6flq6mo8r15ei5d9nues44/mopulanuruxegomoxafu.pdfIn PDF document text
    • 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_off00014226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14226 17248 bytes
SHA-256: e6fd42a3b9fdaed6a9f064873ab06c8e5496492361d0d796b9d086c58f0ef62e
font_01_sfnt_off00016f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F20 10640 bytes
SHA-256: bed8eafdeda245af58f9b3220a1b57471b74941ce7135dc706f54c8931fdf6e1
font_02_sfnt_off00018770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1