Malicious PDF — malware analysis report

Static analysis result for SHA-256 7480b9dc55a07178…

MALICIOUS

PDF

83.7 KB Created: 2021-08-29 08:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef1fb98233bf2e5b3142952161ee09ce SHA-1: 335fb309d14766b4a1f8baa8d09c9a2af23e1338 SHA-256: 7480b9dc55a07178e54537040af2eefab03c4ebe9bbf0a2d981dd1a2b1be8e10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are identified as compromised WordPress uploads or disposable hosting. The embedded JavaScript likely serves to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://colorfulmedia.de/fotki/fotki/file/zotomituluwovalivigubeg.pdf In PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae10e6d392---9169622038.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7165855b51---zakugubajozakigup.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/rijud.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/bemokebubipazomime.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/sewosivadut.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/22611536552.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd400a8a37---zurijirejox.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/30146744549.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/94493205584.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c2647680---bufapupekufisikevipinozad.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tagula.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/78474491269.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e54b945c2d5---35230520818.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/k5ojf14kgik7lr9qkji8e04pf3/nofatuwutujo.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffdecde20a4---29809813918.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/ridosozijofuwul.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/6p4ojutlb0rs56i7cm7oej751h/48498623846.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607acdb9c6d5e---radujijitanelowiwe.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/3997699519.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/58408876028.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608496e55e2e6---wamifuf.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/93146388409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=botw+temple+of+timePDF 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_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 10124 bytes
SHA-256: 641d7f95cd37df3c6d0e03a9cdab868cf9e1f3695dbc91380ae59127b231a6ab
font_01_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 17920 bytes
SHA-256: 1b4a12c4b5a30b9593160398ca25b76d667807c7c2a760a866328ef2dd3b089f
font_02_sfnt_off0001290c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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