Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2f9e2c9e0d7eea…

MALICIOUS

PDF

88.3 KB Created: 2021-06-26 02:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 233557d7cc60fbd2a7ad52054b81682c SHA-1: 486fc847e973be75cae2d662a94618a9bfb499d6 SHA-256: 3a2f9e2c9e0d7eea48b5eaacf94c83e534f1e8d6374280e07198b84fd78e5b32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's part of a phishing or malware distribution campaign.

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 https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088da8606ee6---fotukexoken.pdf In PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1elt2njac1f18mp0t3cg0njpo6/vapikagasofulebamufa.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/efe206874d3a2aa9a9bfd1aa3f8d71bf/25297020709.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/9a46f8246af0f53d464b3a35bb870527/13982739242.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/nubiwofawagojuruzem.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/53797430241.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607190ac565a5---84329980042.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609abfba22b60---xavuluf.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/dusuledekoserefulab.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/junakapinisikifekipi.pdfIn PDF document text
    • http://airsoft1.ro/files/file/betadenupukufotipowepa.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/kixezufifijafegaxam.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/4087601901.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be1913a4a0c---nazij.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/fasonujux.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/78264226494.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087992dc8e6e---14176970512.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/5tgf6htos4hkrbspbkqqm1king/buxufukekuzaja.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088564842cde---43562272612.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608345d524e85---7974001040.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c170c91840a---94955837527.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/47241774196.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/vigoxutorijinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=achievement+meaning+in+bengaliPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011323.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11323 23056 bytes
SHA-256: b43fa9fcc2dabd1bf40307d38a426a639fe36db038bbdad89dae7414bf8d95df
font_00_sfnt_off0000c6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F8 19652 bytes
SHA-256: 90f333a8e6a4d55906ec6827a2998129804b5f185e997eb4b1a0c98838620881
font_01_sfnt_off0000fb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD2 10476 bytes
SHA-256: d289a0c0bd0c3295e910b1c3fb41b96e3643fcf7b821c983c7abb0e7d2371780

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