Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fc2cdde67026a3…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 14:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ff8772da7deef01ba38e5501fd50f0c SHA-1: 00cea4a02817730962f1fd8a9a94723a656a99af SHA-256: 78fc2cdde67026a3db78b847ff61f63447ce03e36f36e95e72ac8e69261dc727
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to direct users to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://inwebjor.ru/uplcv?utm_term=williams+obstetrics+latest+edition+pdf PDF link annotation
    • https://amadesafar.ir/basefile/amadesafarir/files/giwodijulolapasud.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/38153303577.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/49051837774.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/84784022363.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0202223eb---88045617331.pdfIn PDF document text
    • http://labsshop.com/d/files/42789849161.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/josefakumumawureropemexig.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-14/20210914151739843175.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/wajafod.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613544dae9578---34196001663.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614070fe93b8f---gejeduvinowuxewofilulipur.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/tezonirituxetadilos.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/jekimodemudawasazuxosuva.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/36085284719.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/lufuguvanesij.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cad462d19a---janowona.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/15659774194.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/mixovusunowopaxuzami.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f59df1a438a52fca0ff25ecae31341c4/fedijekijo.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/438dd4c0a117ccc1d6ea8f5fe2948422/nenufebusakatezufuvedo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161423a994cb26---metiwamidevulizer.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613006599d793---bowulifebimamabo.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/58238142419.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/76928261130.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/valebutifafowajut.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/51183943893.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_off0000d42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 16728 bytes
SHA-256: 7da48f212cdc75464ba6f57783773789a90291b6d65a0f06715e1f0c5b6d9b32
font_01_sfnt_off0000ff06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 10916 bytes
SHA-256: 07db71465d6405675274377b5188bc2e5c3e84706b7778b77ccdc606506e5672
font_02_sfnt_off00011812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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