Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12f502d94daf4b5…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 06:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31e278185ade202453259a0386352151 SHA-1: 2b5aacfad4f27c2932a0dcd492cf84872468f163 SHA-256: b12f502d94daf4b50bbcb6fadc35a439d633b6467e6098f9d90a2dfcbce6253f
156 Risk Score

Malware Insights

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

The sample is a PDF identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations. The presence of these links suggests an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/dc34fb1c5186de08b2a509d9ee1f953b/mowamexiwe.pdf In PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/73a6a326566622564662882641863691/xixubuvokebonazezudabe.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b38104701e---zisoweritexi.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/pepadipaxed.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/13219816584.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/jividi.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/rajereg.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/elv5pdgivqt8d0s591tb40nfm5/24813831511.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/71629828879.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/40506960278.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/49244497444.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/11459779535.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/f5840l9kqt801n0mlu4sh63f46/divilajubiwatusogu.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/vudabopofafid.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088059083971---wotoxit.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/dazute.pdfIn PDF document text
    • https://domilot.com/uploader/files/99541349394.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f435295e7---bijofa.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/ririmegujituxiwo.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/nokosubinodi.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/tumufivusevepapipusi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/18084253556.pdfIn PDF document text
    • http://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/24682756619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=past+tense+verbs+worksheets+1st+gradePDF 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_off0000d46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46C 10828 bytes
SHA-256: d511bbbc7d39e9a9a4f20d99b5f34f318de9d2612e2b13dff729a1f3ba24abc4
font_01_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 17956 bytes
SHA-256: b7b91b118f405ddff4f73ba47e25c5f2184f689eab6539a6ea4e0ed329bd2157
font_02_sfnt_off00011c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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