Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56fc95b67dac63a…

MALICIOUS

PDF

93.9 KB Created: 2021-09-02 15:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3a7ab19e3d01bea4f368a98d7afd0e87 SHA-1: a1883899e40480e198a3dfd80ea04c157bd719d0 SHA-256: b56fc95b67dac63a1af16b6756a9cb0db9c5cc3179c383464974c440e99feee2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many hosted on domains associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be junk data, not user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://hurtowniaroza.pl/upload/files/85683194337.pdf In PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/27494229857.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/40005326245.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/bcn8oacv01cmbn8n5caiv6beds/17983897811.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/92465314971.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/pugozerowu.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7430c3f3a---mopanarunesegawotoko.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084e11d87c2a---41896261082.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/zomarijemoxorukafum.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/vowatelugedibibowebevip.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9ea4b14e65f4f8e808aac0e194fdb9e1/60074131717.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e1bd58e13cc874dc0e8241c53f5733f/11815932379.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/mewol.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00c1c7d8a---12272578158.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/tigukenanoduzasupona.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/51798843374.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/63d8d1227c0655e2da6fad92669bf5cc/65150592831.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/linegexupawomezegisoxo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b19f7e55cfd---tubinoxesuwepijez.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610b2b4b93d14---zaporatoxazaxusa.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/68021704136.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/457a331a4417486f8e113c43ed833387/29079674644.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160aa318597bce---41550140040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+reflow+android+freePDF 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_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 10168 bytes
SHA-256: 1d0be1b3fa3ddd8e693cf66a59d3b4b404c5216cc6229aa358675a48757581c2
font_01_sfnt_off00011f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001379f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379F 19388 bytes
SHA-256: 47088f5a3ab1bb4cc117faacefa63733afe0da765d4e5255303b8330186b26bc

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