Malicious PDF — malware analysis report

Static analysis result for SHA-256 420070c9b8dfa3c6…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 06:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2fc88e7c15bd8dc1271795909d4fa64 SHA-1: 635a79debd2c64ad896c16822587d959dc93178c SHA-256: 420070c9b8dfa3c6bd7b4f593dc7ddd00a40884c2b90e1d8bc69ef047c35e7bd
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of a 'download' button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://skpizzasubs.com/uploads/files/98138966984.pdf In PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/wofajuzufopozimelotita.pdfIn PDF document text
    • https://temahr.hr/files/fazekoz.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/wexaxisizaxeregazapebos.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/32062965034.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/kaxakalunuwedisek.pdfIn PDF document text
    • http://packamate.com/userfiles/radagiruzudeboxo.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210818_183737.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/53009188695.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/85a276d4d7364cf3b49817a73bb8cc27/gosuvezezi.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/84657076849.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/1uvo6vceactd9hqhq96j5u9arp/benifemewokuzex.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/zafutulizafirirogupubi.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a1a4b8e6a---68588832462.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/nveim23hab2ig0l48o0g5i6rjp/wefejogeseduzinid.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/du85beqvaioadq55mkk22qpv26/semegesirevub.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/31559385261.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/xikujatuzisov.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/d9b4c1d33647c957609614bbfea30be6/finekagijawuwezur.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979cc6efd50---bopije.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708daa7f2f0---84200096313.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/8pteuokj6kka5g11891uk24ie3/79424318545.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/pfbhof3n364oamslnrtsufuddo/48473029890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=convert+pdf+to+powerpoint+free+download+full+versionPDF 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_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 10776 bytes
SHA-256: d56bd7411f312587c794c46be2dc46ea6576d79c54c6400194d25064f4b348d5
font_02_sfnt_off00011468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 18592 bytes
SHA-256: 63bad976153af34d87f1e2b971df0584bd13eb29a92b7e9825c9f30c565e44d6