Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc653ae90987093e…

MALICIOUS

PDF

92.4 KB Created: 2021-09-03 22:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b81c98ffc6c35ec127e75794964b66a SHA-1: 6a54588ee80dc1aa8115e86ddd50749500aa3d9a SHA-256: bc653ae90987093e67068ea87be0865b2786fa3029f8558b5ef82c4c13bf5623
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chcial.ru/uplcv?utm_term=beta+lactamase+producing+bacteria+pdf PDF link annotation
    • http://avsa.org/sites/default/files/images/files/53137341788.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/98750720381.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/57583704732.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/42005167836.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c7850fc9b756bbed69dbae3715983e7c/zugifalivosu.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/laradekazezedowewovekun.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/165d8cc45c564d373ad012ad09c1488f/gulifiwapa.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4bm5p5dhslqlfclvuat6iaudka/sawemutofamun.pdfIn PDF document text
    • https://digireg.li/upload/kolurabamubatupid.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/57455857001.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16241624429898.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/vamizowin.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef33276c0---56946128767.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/541edb09c5c417554352b38c8efef551/23100774135.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9edfd961a9---37260634147.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/vajutavabadupidu.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/29688650348.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b241d6e3355---99642808915.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccee87f87f---55954420741.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/tnt4iitekv79a2q197ne8ce3nq/fifinibomogopadu.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/61859138868.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/97520230916.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/xogivojoreduduvalu.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160816cca4a87e---begonafo.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/teriw.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_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 11256 bytes
SHA-256: 8aff0402a2f52592594e3341a4dd0892bd42d81c2d4455f500e046030cc926c3
font_01_sfnt_off00011006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11006 23332 bytes
SHA-256: e3e58b4829d53393c80523e9ac540f0032a5598f325764a091ae5463769ed7d7
font_02_sfnt_off00014b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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