Malicious PDF — malware analysis report

Static analysis result for SHA-256 626c28e587032ba3…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 04:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b9d2d0e81a4760dfdafcd586f7cd22d SHA-1: df38e6a39b87d97a7e2b464a657a60f1d01ba526 SHA-256: 626c28e587032ba36a121a6c75cc0335283c50102ddbe9d88768b1178e8e228c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains identified as link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially malicious sites suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://abwfinlay.com/uploads/files/68206145166.pdf In PDF document text
    • http://refta-bg.com/userfiles/file/sizikopigademozunek.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/xubozizedogefimubezizog.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4613ccbfc---4375775885.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/barazinifu.pdfIn PDF document text
    • http://eichler-kammerer.de/73414622150.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080036776c00---19514247380.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a751f444b66---gofevumuzosowolotupom.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/48538734782.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/763e59fe31f30d488b829fe6b3f49056/4000203961.pdfIn PDF document text
    • http://nfc.soo.jp/file/42135388983.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/1368723316.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/25876123831.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/77771894442.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/novuruniga.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/2062521368.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160e78c757f39f---50108363995.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084eace7e045---762006868.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/wijapalojigaruzijitepe.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161152c8e80bfa---31690163015.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/buwebubopegizovum.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/21218094934.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j4uk1en1i5554c3u2cuulh0qd2/97540829966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=counting+worksheets+for+grade+1PDF link annotation
    • https://mediaget.com/userfiles/files/gumegexujaxijelipajari.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_off0000d77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77D 16580 bytes
SHA-256: 412b8152dca950ac53ae03b487cf752ed3ce3a23edec488e5fd7e51f243ec7f1
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 10948 bytes
SHA-256: 8004168f29fbea395fc23bec0fdd1bf736a5ebdacbc22ff31e0ea3a8c5387a06
font_02_sfnt_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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