Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb30cc5c1b956c99…

MALICIOUS

PDF

92.1 KB Created: 2021-08-29 00:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21c4550c612b7cb0e72b2611b58b9b9c SHA-1: 478e67f37e5be75869fc9b7dc37dc5458615ca41 SHA-256: bb30cc5c1b956c992a349fa7b4adeac6008633d4a140ebd0699efaa5b71a5872
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to obscure the true destination. The presence of multiple external URIs and compromised CMS upload links strongly suggests this document is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://allasclub.com/campannas/file/8774774766.pdf In PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/6b8e13765a0c85bacd964da9ba9d88ad/21586438825.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/41148961978.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd045d5de---96388206002.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/jemekepidaluvigel.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/18467777170.pdfIn PDF document text
    • https://spacio.hk/attachment/file/vekovalo.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/mugavas.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885e4c2d407---21051027074.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/getesasutefa.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92cd615df---18727716987.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/zotofujizokatojig.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b5a5b2e10ff088d1b436678633eca168/gafiserudigip.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/tifefi.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/ribudadapojunipavigu.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/66711231270.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/rovuvibudapinazata.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/89154195121.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/28759109467.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/c906b0cb659acca850a12a036b41f331/17753200298.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6089966bc---juzegedupesazuzijebijim.pdfIn PDF document text
    • http://altinay-law.com/images/file/97856399919.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/lowokikarunexefenufol.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7007ef66a---gasozusokekax.pdfIn PDF document text
    • https://citytrafik.nu/images/file/98584755395.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/dirifanixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=create+new+array+in+javascriptPDF 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_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 10628 bytes
SHA-256: daef27a90ad08bb48113b0a79f6394e6898dff255c328ff48fd4f68a4b630ff0
font_01_sfnt_off000118e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E6 18652 bytes
SHA-256: aa4e0908dbbe101277727d12ab171d4d7912a78f7b70734b5cc413388b718672
font_02_sfnt_off000149a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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