Malicious PDF — malware analysis report

Static analysis result for SHA-256 561237522385848d…

MALICIOUS

PDF

165.8 KB Created: 2021-06-30 04:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 599949bef799669ea333f20cdd78518e SHA-1: f2c93446165be9bacecbdd20858757a3dfddc14d SHA-256: 561237522385848dea3c7a9deec1f400ffd18ce20d26eedb9abcc8b1db4e7b4e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised CMS upload directories. These links likely serve as a link farm to distribute or host further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9561

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://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1837d59552---37709462781.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdac1b3a4e---83141707399.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c408a68ad4---66908549489.pdf
    • http://budaikepkeret.hu/uploads/file/guxifetami.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/29400051523.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/q7dk4r846s1g40ciepla3js8p1/77604687002.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/enca0r2qc5tg41mcef659gs112/ginuwijisi.pdf
    • http://centronegozi.com/public/64415911971.pdf
    • http://sparkpro.lv/content/file/35158672177.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/lanupiviwanujedinuziba.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/c40804a215bda8c35feea56c5bd7c3f0/xigagugibekan.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078abad162d0---11479410363.pdf
    • https://airshow-bg.com/file/53242232022.pdf
    • http://alemotta.com/resources/original/file/nimejabatepabewuxaxip.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/uche72micggi6arsr793kr7sdm/28067313746.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921cc32df9e---38245669224.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0a22456df134246b7dfa352f551f80a5/vijevadam.pdf
    • http://rmgoals.com/userfiles/files/79044914676.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b2064ec1c---kejujivijadixajolaralip.pdf
    • http://z500.si/files/94212224499.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebd65c975---16058622594.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609838ad71fb0---xutipexagakaju.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/5fvlktbsnhh8up7bt6j64cbidp/lanizujefufoleri.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=names+that+are+related+to+stars
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0002425e.bin
b77053e5b96394446143e4edf026bc4d93e0e0d89bf05e34f978ddef55cf0e65
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2425E 27380 bytes
font_00_sfnt_off0001cdd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDD8 16792 bytes
font_01_sfnt_off0001e5ef.bin
9437cdfee06344c81d5533fcf981a586b6d3c2b266dc52dd4bc5a0e9f05defc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5EF 10292 bytes
font_02_sfnt_off0001fd21.bin
4edc202862a99ccbb46ac84b0d0a88889cf3da1d13b22247428067586b36c3e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD21 29008 bytes
font_04_sfnt_off000273bd.bin
b439237f0f3779e5000a5e8b08ce8595d56983a16ecd9edc670a4010f3511606
pdf-font-stream PDF embedded font (sfnt) at offset 0x273BD 5284 bytes