Malicious PDF — malware analysis report

Static analysis result for SHA-256 b381854ee766db0f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 13:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 24214cdf2f73a68d54c3d6bc43fb1b6d SHA-1: 8dd53f6c5d361c356405257003aa6c4e1fdd8d02 SHA-256: b381854ee766db0f3ed0a5e2e5159577dc299c06afb609eb2a5bc1c0de99cf44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/519ea9f40335032fa8847896128db3a7/pupowosavaso.pdf In PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4906354c3---15152150974.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/38668389956.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/sonedonoxipuzixodog.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ae55ec8ee13cb141376ccbeb950c7e80/8666930902.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/vabuzukoxotimugu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77d863f495---37788938854.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/pugunedopusevid.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/15880137496.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca63ec146---76243457027.pdfIn PDF document text
    • http://feminella.ro/upload/fck/butuzurukitid.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/5efdb47dfa213eb69711699d481e0c55/98374572466.pdfIn PDF document text
    • https://unitjaya.com/contents//files/zapovunoriza.pdfIn PDF document text
    • http://myqself.com/upload/files/zojizefelo.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/n5ed2vsf589oi8ruuujpmbnsj9/nexanexalabajatulekiwim.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/94209182655.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/pubozorojopukunena.pdfIn PDF document text
    • http://moodyhighclassof70reunion.com/clients/2/24/24f6aee67edc386a60746049a176a33b/File/girasuruxulawamidaze.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/bewerugoxelo.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/96194615385.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0cc6c6b50---87823501687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+to+word+conversion+issuesPDF 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_off0000d382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD382 17472 bytes
SHA-256: b51f18b978d8b01576a7a2eb6dbead75733f4ef6324b6230857a9905eba3430a
font_01_sfnt_off00010026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10026 10516 bytes
SHA-256: 0465ccaffa690ffc1cf98aeb7e8a8494d3a4db3f5e04d40597b5f97061a916bd
font_02_sfnt_off00011854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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