Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5a87f96f204c00…

MALICIOUS

PDF

96.4 KB Created: 2021-06-26 17:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef718759608c90a09bf95d15a0ebc016 SHA-1: bf40e2174e2a6eb97cbb6b21a7371b1ddc15e5e2 SHA-256: 8a5a87f96f204c00dd741f4d97198c4b65d2dfce1bb4637f11594c04f0fbaab3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into downloading a password-protected archive, likely containing a secondary payload. Numerous URLs pointing to compromised CMS uploads and disposable hosting were extracted, indicating a link farm strategy to distribute the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607523f91754e---momuzis.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943d251c4cb---76758422584.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078dc901b0c0---40439468074.pdf
    • http://dharmapremipariwar.org/userfiles/file/86158018129.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608611fa10a61---15386223625.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160743c6a3bef4---fijunurujuxikowevisiviz.pdf
    • http://mwflower.com/upimagesfile///26475305776.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/66572926685.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/4u1mub9b2tpvhj43ku12anfabd/78623293823.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d2256543d---44697907020.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160810693312ba---pusudebafugujek.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e558fad44f---rejupukigewewarirufujan.pdf
    • http://buddhavehicle.com/userfiles/file/1397135599.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/7aa681a9a44098bc98118dead49d4050/patotut.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47c554701e---86059744941.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae303ac76d3---bifag.pdf
    • http://shengnabei.com/uploadfile/file///2021061118553694.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b555a6057ee---wudezemorefutogizibej.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/3cace069c37b9c83b2d846e6ee2ce67d/niripi.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/706489qch5i1ssridjomo284qb/35289282199.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/miguvufo.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fed33de7be---mojum.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/lasimibemetemafe.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/fgspm0gdivljcgluaoecbsdm4j/91104388592.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6115c2df0462e02060b00d9c9bffcda1/vowefovipodiju.pdf
    • http://frangarcia.eu/upload/file/63620608330.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=elements+of+literature+textbook+fifth+course+answer+key
    • 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_off00011187.bin
d628c47ac10cf864a67c2ac0bb335a046ed7a82ba6a2e6a0853afb429754dad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 18228 bytes
font_01_sfnt_off00014159.bin
432614e0ca50dc7aaafbb360ccfe73ab2e556e252f5a2e6edf3a76c8f91e86ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14159 11220 bytes
font_02_sfnt_off00015b81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B81 16792 bytes

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