Malicious PDF — malware analysis report

Static analysis result for SHA-256 503bf4be3701f89f…

MALICIOUS

PDF

85.0 KB Created: 2021-08-13 17:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1a16356016026a3550ff7177cd37175c SHA-1: 60d62123466b8aa3e9b5c80a4b6e099cb0a62c96 SHA-256: 503bf4be3701f89f4e9ed9abb7b7bd09840d65f39a70342495f05c343eb1cc35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. These links likely lead to further malicious content or phishing pages, suggesting the document's primary purpose is to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=basketball+stars+mod+apk+1.26.01 PDF link annotation
    • http://novelinternationalschool.com/ckfinder/userfiles/files/41435921827.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/40355732090.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/nuxujenafisibimizesosu.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/83924854647.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae38b371442---92482465440.pdfIn PDF document text
    • https://btegypt.com/file/ramemunokefodaxila.pdfIn PDF document text
    • http://tahyuh.com/uploads//files/202108082142412430.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/0b1da172060d1607cbeed6fa9a61bc0b/84203251890.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a3e1e32e2---91570052859.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/78b1dac081888da42818cbbf6d7c8c31/pewugopok.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/5656721743.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/40or6tof957tai0168kpbuflj5/26233996035.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833a05ea0b---watobeketazumiwadalil.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/fnc6i34jak0nqokgte4dllbab2/sekisog.pdfIn PDF document text
    • http://salt17.com/userfiles/files/24568014949.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/pepalejupaxogak.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/vozejuvugiwefo.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffb1d2a82c---veweginoxajezazalixosiw.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/38399414.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/b56c425915b50b8687566a223568d9df/40019959283.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16096750264169---buviwikaxababeze.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/014717235718e237c7b9b0a9e31f3df9/kosamuwosareku.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/dopajuvidetug.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/22414387697.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_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 11172 bytes
SHA-256: b50e527398302fe0b0342a27195aea6a3b415577eabc4d895bc91834345dbbda
font_02_sfnt_off00011a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3C 16984 bytes
SHA-256: 4f529e5af3a683e80b4f04c6eb619c6a14cff35cfc8daa9895cf5851f5f3d9d3

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