Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c67ee670e73aa0…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 02:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ef94242af6cd2a856ca9ae13ec85726 SHA-1: b34104d9c3318b05da09c5082aafd51df1fa7745 SHA-256: 12c67ee670e73aa08c8626b15d0a873a316455781d609e8c0610a4a01d5f8a67
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan payload. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of a link farm on disposable hosting further supports a malicious intent to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://como.gattinonimondodivacanze.it/themes/userfiles/files/zunejitagekutotaludozok.pdf In PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2735a19b3e---70343826832.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/15867933220.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/26f658851eb100f9b779c5b682e2ab1a/zepomusabomudiroladoxok.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/7942117339.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/xawaboleregabixes.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb586ae10f---bidarosoxemi.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/refevepivodasufek.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/kulufiruwovopisiduxo.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebbf4e6cb1---45076779204.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f2241e383ab---rekidenif.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876dd798bb3---56629148012.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/58808654823.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/80729849093.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/36081607258.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/gotowojetafilivegulimanaj.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/30322417286.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/29151191927.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/41762720930.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd66b5ac2---lumuwix.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/47377478785.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073e52b8ee56---42914601610.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fddd8e321e8---xenuvenuvogujexalini.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/walobijarejov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=drayton+digistat+1+manualPDF 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_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 10724 bytes
SHA-256: 21e5e8b8374edd59a41505a048ef3c5a76215b65bb1db4d7645c3979735ef264
font_01_sfnt_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11188 18472 bytes
SHA-256: 26bf4c1c069f2422398dbe45eed3a9f7e97556c9e803c1b054f8c50b9e466f96

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