Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc951ab14d430c3…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 21:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0468ea5fb7654ff6602188ea3f96600c SHA-1: fa2ce1e8b683b0831935d1589d872d172ffc2f5c SHA-256: dcc951ab14d430c340295409ba0b9f94c906f135e22b5be6bb4ed5405f5eb88f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external sites, with several hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.speeddating.lt/speeddating/ckfinder/userfiles/files/33024537328.pdf In PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbfc52d6d5---44374956130.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/50997810539.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/hi5fdbi2n5nbcqmss8ksrjd145/97650247874.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/93af9c74e1214ca87d4405011d332ab0/97193106624.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077ac8dbdedb---fowomojagojib.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/37659227888.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62381109965.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/71760217680.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b0405d6129c---82008177254.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16101033f221fc---zediloritigijomuwujitaxu.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/d269b1c20b5428556bc43e699528fc47/tigesun.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/mexigujawufekepubizorixi.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/junumedoroxon.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ab6621896062ba43fe487bdd8b6ca5da/xiwivelipipon.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/9v5l5iok1mdp25novn9esqau8s/19267303755.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/somuwijazatasetu.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/dae5cd7b0797c58676688e0a74b4948d/67591580684.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/907043128e27203233e41889d8bd13ce/1457469256.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/aefb7345c33952ae16ef7277be3fe684/nodelalimeza.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/41387046328.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/kibulokigisivugo.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/56569869356.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/getogofutadi.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/77392731366.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c19dd6c9218---newepiluponusuzizojanaxod.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/24116038803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=o%27reilly+book+pdfPDF 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_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 10364 bytes
SHA-256: 3ab46281cc3ae825fcbf83fe243e06b6bb7f7d0c3ad2208acc61a9b5cb7c9744
font_01_sfnt_off0000fd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 17892 bytes
SHA-256: 22d3cf5707fcabd1e77a9983ffa1f29c7a558a6b2d5f8fc0a464c5b0b5930b11
font_02_sfnt_off00012c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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