Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ba7abff5d19a2f…

MALICIOUS

PDF

84.8 KB Created: 2021-06-26 14:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c7d94da13fb33be21ad14ddfde113d5 SHA-1: 47524ca88d290bc94c90560967f221780933024e SHA-256: 33ba7abff5d19a2fdcdd78e5f5a5d6bdf5d69ec615631024908f82ee27d01153
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links strongly indicates an attempt to lure victims to external resources for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://pasarantogel.com/contents//files/45490928813.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5lca419p6oa8cccp5769aofkj1/jinusalebodemuneladuzo.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16071d079dbce7---lokalawetitutunokejo.pdf
    • https://accuratesearch.com/userfiles/file/xejiwuwuvilu.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/a5apvmqfj5uq90r47pej774b7n/ripivofifowopusefapanexi.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/43795792811.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/2oaoghp8uooev9p8ckag5pbok6/52906211211.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609484ef93876---76250728755.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb12aaed74---zadibuwadil.pdf
    • https://egca.fr/userfiles/file/99657018228.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607056c7356ee---luzexosemujusenazizuw.pdf
    • http://dolphinegypt.net/userfiles/file/39818424742.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e8d216c998263cb12e19aa50193c6ac8/51237647944.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/fmameb45q68ri6tr9e5p91035c/72349317503.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba93eb14b---66258613072.pdf
    • http://amphorabeautyclub.com/campannas/file/36748829478.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/705e4ca90adae22ce79e4e95ccd73206/67650671233.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ef3075a29---67699687298.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6574b238344226a630920f27dd4ff048/nawizoli.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/95d0ea9a8002c71156daa89c332ec2a6/20114187085.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad6a43647e---41461945109.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bb06e6c15---zofodanolibubovolup.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7189e7704---welanuronanow.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083c26c5fcef---xuzogojivapi.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/27dcdc5ef034457e7e36cf800339e6ff/50460740324.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/dfc057de02fd04ff34fe54f7151730ea/kizas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+answer+why+are+you+unemployed
    • 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_off0000ea34.bin
e1667bd44c13eb596750f89df749f81692c13bfd1185bc40cd61f2f835cad9df
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 10856 bytes
font_01_sfnt_off00010324.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 16792 bytes
font_02_sfnt_off00011b36.bin
f89118d2cd7c32b29d4e4df6362a9b27bf126bb21883d33ccbffc8f284aa7f40
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 15824 bytes