Malicious PDF — malware analysis report

Static analysis result for SHA-256 929b057df6befbf2…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 01:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 546aac111abd1f7c55bad8b802846fb3 SHA-1: 68bec3e56caf7f626b710e2fe02c67a32a5290c8 SHA-256: 929b057df6befbf2a2013c599c86ff0860f6477afe26339bf5bc2b99c4616e7d
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised WordPress installations and disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=what+math+credits+do+you+need+to+graduate PDF link annotation
    • http://thrifty-uy.com/files/others/83417472474.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/01db5cc2fd19a3db14b069f99b95ff61/xeperomatorobijoxib.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072e50716746---31448359950.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/4615826976.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/060890ee1eaf9f70d88c8850626b0095/84089201027.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/50cec72e9e86ff40b9f9f3fb582c36cc/38257437472.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/pulekukiz.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089988ef092a---kegududopupivezojogo.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/ekklvq6p1fpsdtkv5fdcn7b9ce/senajedukemafadegu.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/86367978672.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/rawizuxatuvej.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/ditewa.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/69769003556.pdfIn PDF document text
    • http://3sdent.com/upload/files/71975616873.pdfIn PDF document text
    • https://badoza.net/userfiles/file/11556566607.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/65901068995.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/16071659928.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/16289366257.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/galaremotaworujomo.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/noguguzakuxalusa.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bd23e272da---62005895853.pdfIn PDF document text
    • http://cmtsport.com/pliki/voxinajozabaxuxun.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607020b46b900---60111931630.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/96640187953.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_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 17796 bytes
SHA-256: 796e4bfab12bb27fbe59bb7e56fdeec2c33a77b5f376f61cb1466d978227c409
font_01_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12930 10980 bytes
SHA-256: 137e9bc6bd8e0a249e17006cc255d76e46df7166cc6c25a51d7de6bf755857c9

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