Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df2e80095eaced9…

MALICIOUS

PDF

108.8 KB Created: 2021-08-21 21:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9add2c20923b61f524d4814261bc7820 SHA-1: c2dd5767f830036145aef5ba37976aa98b8daaff SHA-256: 6df2e80095eaced9d1df902965537452b60f0d6fbbe0a905356ad8b784506855
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains numerous links to compromised WordPress sites, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of external URIs and compromised CMS upload links strongly points to a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 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 https://archism.ru/uplcv?utm_term=how+to+check+office+2016+32+or+64+bit PDF link annotation
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3884d8a55---fepapasofomasobuboxo.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2610bbc36---vixud.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/aa7a4253126f944fbafac1abebb91808/73697211158.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/72873078766.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/kajegetufo.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/99099685eb914806b1b23adcea3b260f/lokorunazuzawifaraba.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/302237044095.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/kelotidufozawalipegigevep.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/lewuliruratomalabesawasa.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e1a3ee8d---vomujelaledovemodawipub.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aae2cacf7af---votati.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/matapakaxutesaxir.pdfIn PDF document text
    • http://normel.org/files/upload/file/16489090.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf4cb2111---42739454178.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/5402977219.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/70033900662.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/18629932396.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609cecad86ffa---sozosiseratapexijeliz.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/lijobomoxupav.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d4beb1c398c01135140ea03ff7811fc7/20333468834.pdfIn PDF document text
    • http://homeopathyhk.com/files/kafuwanoban.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/ecb84ca33603344987e03eff5bef5edc/kumisiwixilig.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d1bb18bc---44332470000.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/3c6ea3f9cff801356a4479dda1a63936/doxaniragobilekudavow.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/d0dpurpnp1pk1sj5dsimnv7fa6/bulexil.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_off00013103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13103 10976 bytes
SHA-256: e9f3e536d8a85b59a426447bbc301a2f339c5f0f0ce364503b33bea269322850
font_01_sfnt_off00014acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACB 24904 bytes
SHA-256: c550ef87cf85705010bb61768100d31fcf35d8fb195eeae922ef9dd79f783f6a
font_02_sfnt_off00018a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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