Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ff6658fed68c1a…

MALICIOUS

PDF

70.1 KB Created: 2021-07-19 10:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c51b59237eb51f465892fd7d8c684b21 SHA-1: d262768fb85fd0ecbde1eb77dbf4f0d3017865bb SHA-256: 05ff6658fed68c1a7b57d5df6f1df75f8c1097677762c87829b482b11725bb0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of link farms often involves JavaScript for redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd65c9419e---79977690346.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/993d86a966fbdee4d053e003f3b8b5a6/daguso.pdf
    • http://www.aluvascientific.com/UserFiles/file/66397839171.pdf
    • https://orangerun.re/photo/files/tamekeragox.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4c5e8de45---bolakoxuzawuviraxo.pdf
    • http://fixafilm.se/userfiles/file/xikukono.pdf
    • http://nrnchina.com/test/images/ckfinder/files/71093361990.pdf
    • http://lawrence-spruill.com/clients/42275/File/53416882015.pdf
    • https://activepymes.com/pub/file/11145243122.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e1f6ba7f6---81352620003.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/2j81ptpvh84hefbpdq0o3so0ru/71322123977.pdf
    • http://mevlanaasm.com/resimler/files/90965492567.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/92e6586a9cc0e57665946ce44e0a112c/jubejowu.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0070bcdda---gezovawekulagobuga.pdf
    • http://sage-chem.com/image/files/20210621_120911.pdf
    • https://eobliecky.sk/userfiles/file/soxugaxamajukepepolid.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e64a649b3---larejezubabemi.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c318d72a39c---fafogexenadifovan.pdf
    • http://liccuza.ro/stiri_files/file/lamijoju.pdf
    • http://1night2daytour.com/ckupload/files/51852658201.pdf
    • https://securityguardsupply.com/php/uploads/file/18489379169.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c0282afb9---59802005852.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0f0f42ff4---galuwirimituxunijiwisuxi.pdf
    • http://smcertificationservices.com/userfiles/files/99003919685.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/saminuv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hoover+flair+manual
    • 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_off0000b6b0.bin
753f1d5044b461abff8a9151243d7e737444beddee5e692460e725eb6c2f9ed9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B0 10268 bytes
font_01_sfnt_off0000cda1.bin
a56c3ae2c74d8dc4f72fd6f7508bc08bf24ab6ba1aa4ae669a9b25d3bc7ee942
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA1 14908 bytes
font_02_sfnt_off0000f33d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 16792 bytes