Malicious PDF — malware analysis report

Static analysis result for SHA-256 0755a23319204de0…

MALICIOUS

PDF

83.9 KB Created: 2021-08-23 09:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8d2a8140aa4113f2f560481d42540323 SHA-1: 6648fec8a069337e092a4a60fee6f018ed41e2f8 SHA-256: 0755a23319204de03c1cadd10c42d3be9a3d87e66c2c1c0eb39d17cea311b3f9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV and ML classifiers confirm its malicious nature, classifying it as a phishing trojan. The primary attack pattern involves luring users through a malicious document to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/vhaiie1955hlt3mq1hvshk7ij8/regugalemajamosasaw.pdf In PDF document text
    • http://camonetinternational.com/files/file/73965438885.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/zunonor.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/cj5m1evr0p1ufqqv547egtn4m3/49942215536.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/14219448872.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/waziwokimexofozusox.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a44ce7a5658755d293fbcb19e7849247/24197461517.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/5p4lcf51hk7a3p885rd2ecu9b3/77415126082.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/kunuzopalivosezojeza.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/19267230860.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712fa98061e---21061778994.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/65654449454.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/dejaxomepijibupemaladiwi.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c76f06a717b---34200448191.pdfIn PDF document text
    • https://777mto.info/contents//files/31693325786.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1ac374478743f165de70ac2dc09d5b68/82530234165.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117bffa8d014---18269990395.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a77c4a0a1---93072251836.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/jemukapofagot.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16071d6193c444---42175900952.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/46b23e8225f7ed1875d9464e49c3a10e/33004775013.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/nulavokinasogel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=publication+style+guidePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 19404 bytes
SHA-256: 6c09625d8519003af31e1e04e5e9183467c7795966895f708ad23a674de2197f
font_02_sfnt_off000128f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 10800 bytes
SHA-256: 479ce8f295505775fb19ab347093a4d721c5bbfce7755b3a239f02839a2b9520

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