Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df7582374a6bd36…

MALICIOUS

PDF

84.3 KB Created: 2021-07-18 01:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ae3b3b11025fce54a658de98086827b SHA-1: 51d53cb5228d8e6bb1e809c760f99934ca228c55 SHA-256: 3df7582374a6bd3620a5faa3bd240dcf66d37d0e840f5d43b1cdea78498c4ae3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used for phishing or malware distribution. The PDF structure and embedded links are consistent with a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://flyags.com/editorResources/file///warugapiritik.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071abefdc800---7162581025.pdf
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/30540846344.pdf
    • https://nadamasristorante.it/file/78519873129.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/bojomumisa.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/8450dea6ed7852ca3569c62af170599f/50450326064.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/29435498707.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382e84badd---fipugirivupojegidigav.pdf
    • http://baohanhranghm.com/upload/img/files/katonomudozewezepedozi.pdf
    • http://vnationwide.com/userfiles/files/sogerido.pdf
    • https://krassimirtaskov.com/userfiles/files/10700749559.pdf
    • http://all-pass.com/folder/editor/file/73492298238.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/054f67350bf437bd2d9b5b5bf2e5f3aa/dogusuz.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a40ce49c8da---27236653545.pdf
    • https://mednet.mk/public_html/upload/userfiles/file/lifuzopavukad.pdf
    • http://ahcxdq.com/uploads/file/020259481348.pdf
    • https://contabil-fiscal.ro/mm/file/degironinokotowipi.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/kupikinatukumowakoxobomim.pdf
    • https://recapress.com/ckfinder/userfiles/files/80154501467.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/6456f897d9e975aeaab3c59a29e05440/48058159433.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd2d23bb70---15942731389.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160baed71bba14---89602413409.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=hierarchy+of+biological+organization+from+least+to+most+complex
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e815.bin
a5f58a11878771fccc6a466e38e3d9c20db8c9446a80ae83ace150a1e15459a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 16016 bytes
font_01_sfnt_off00011133.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11133 16792 bytes
font_02_sfnt_off0001294a.bin
87cdbaf35e586ad06a4c0a39981074065716778e7ce41c9d72f813d195d3425c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1294A 11336 bytes