Malicious PDF — malware analysis report

Static analysis result for SHA-256 f685b1aca34ef1fc…

MALICIOUS

PDF

122.8 KB Created: 2021-07-01 13:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0523d7c83b44cf0e294ef9f88e22b573 SHA-1: d6a8268728f8e7560f52e222fa8f81f6bb8e3a42 SHA-256: f685b1aca34ef1fcbf6276277b07eacfe74b99ebf5972b38fbe2dd08ae166ec7
204 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and exhibits characteristics of a malicious PDF, including a high ML score and a heuristic indicating security software disable instructions. The presence of numerous links to potentially compromised websites suggests an attempt to host or distribute further malicious content. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/p23hkqgpr30k5l9801nq1rhbc1/87168394085.pdf
    • https://atamergranit.com/userfiles/file/93667626498.pdf
    • http://extintoresorigen.com/images/editor/3331582283.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2588784d5---sobozabidejatoderen.pdf
    • http://densayhongngoai.com/uploads/userfiles/file/ziwevapufe.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091888179b24---vonuzolotipitaten.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/tisugoruwotev.pdf
    • https://ovalpolycoats.com/media/75319022693.pdf
    • https://istanajpdua.com/contents//files/fapusedigezojema.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aaed9f657ed---67297158246.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608380fe8fde2---98171937640.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a938b258546---35947249248.pdf
    • http://softwarefactory.nl/images/file/jejix.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/3113a500c00e205fecd863d6aab02bf2/93722601812.pdf
    • http://mariamozharova.ru/uploads/files/25742597181.pdf
    • http://zerosquareonline.com/file/38415994357.pdf
    • https://artbynela.com/uploads/file/pawetedemuvuzedutetekamoz.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/41e9d8aa5e685693daa1eb0fded0645d/wuvadubariwene.pdf
    • http://aite-materials.com/upfiles/file/93076077099.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733abc9f14f---64470421911.pdf
    • https://tanthuantelecom.com/upload/fck/file/72360501853.pdf
    • https://muguet.fr/sites/default/files/file/1458031051.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf5318ae57---fovefaxaxa.pdf
    • http://www.deopendeur.org/imgUser/file/67846679754.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=symantec+proactive+threat+protection+manual+update
    • 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_off00018085.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18085 16792 bytes
font_01_sfnt_off0001989c.bin
99ffde7c0bd7374ea512a1e7fef95b0a408d7b01d5b6743bd77f19b3a362a053
pdf-font-stream PDF embedded font (sfnt) at offset 0x1989C 10964 bytes
font_02_sfnt_off0001b1d8.bin
886b27fe615a540cf47dfb6e24246358b22117773382f1882a0f4c967bbc1b0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1D8 16656 bytes