Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd507d4ab1afc99…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 19:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16bbec0e5bd934527c17f8ba846e8ec5 SHA-1: c62b2e6f64b2ef74254b35b114462ae438d7696a SHA-256: dcd507d4ab1afc99efbde6a4d9e25000a9e27ec93244fa9c23826746d11048bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://wastran.ru/uplcv?utm_term=read+tom+gates+books+online+for+free PDF link annotation
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/5b524a2822edb3e36d31f5751e859b46/sebedotagunepedezitewaf.pdfIn PDF document text
    • http://chenruichem.com/upload/files/99630091169.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/lbc03q0s6l5l60444bq6ru4f2k/80884495094.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/61149059591.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/jorezirotis.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/49837571073.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/53651904176.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161339e496dba7---34453802353.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/33541030643.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/85410344213.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/monola.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e13b2448050aa528f9a98f8feb6f5bb0/vemomuj.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/regotatodotusopame.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/xenabubojiwuzefi.pdfIn PDF document text
    • http://parateam.cz/file/tavifagomuzusowevenamofol.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/mawexepanakumufen.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/11201909103.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/62172492458.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140593dc28f0---27249883547.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/19483313171.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/sirelexudanoz.pdfIn PDF document text
    • http://kalikraft.com/images/file/37010809760.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/7757208257.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/xaxajukofizajawifagiv.pdfIn PDF document text
    • 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_off0000afb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB3 10976 bytes
SHA-256: 483e2001c739ba7f58ce73e25c65de554a61b7e3a75db5848e7e7085002d32e7
font_01_sfnt_off0000c8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 15344 bytes
SHA-256: ade758ed27f6a690de7cf30514aa067fd9f72d3ddec31b9c5b2cf2a6c7165e0f

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