Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab11c33248e8108c…

MALICIOUS

PDF

132.9 KB Created: 2021-07-08 06:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 193ee86c4ab93e357853e853d870485f SHA-1: 36f4585705caf840f81cd78fed67d262612ae184 SHA-256: ab11c33248e8108cf44a130ca31e7b27e70fd343ef9ed103e467d4bf2e74e649
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, including compromised WordPress upload directories and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URLs suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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 http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f02236c35---pesakoponijibebibupomil.pdf In PDF document text
    • http://interface-referencement.com/userfiles/file/kojajafulukixu.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/2890676489.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/8e638523326c574dacea09de8d0a28aa/64767913154.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/56776507320.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2837b2c53---69837634082.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/zorevoso.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c064e561a42---loligatawuja.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/174f04a95ec79911635ea84e7e5f3c1c/durel.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad88e49390---batalanafupedisuxu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bef95404c3d---22913098820.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/rubugixafef.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3e219cbb72d07bd9f362b60339b6a522/nirifevizura.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/28524663147.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/247a979c8bbc6ffa485925706af9f433/87967580132.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/64122193352.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/nanajib.pdfIn PDF document text
    • https://faprosid.com/file/jawawagitujufegelex.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160735de2a4a45---pimodipemidomupagevafuf.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e84087f3b2---dekubotuwadetoros.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///kujujitogojeravezinofuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=good+introduction+sentence+startersPDF 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
font_00_sfnt_off0001903f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1903F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A851 18176 bytes
SHA-256: 45e68c71f46701be56d72024c8637add899c5d5ff22adba78b5363ef8228be40
font_02_sfnt_off0001d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D83A 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off0001edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDB1 10456 bytes
SHA-256: a1f1ca183f8c1672c099294d31e5f7eab4bf33780aef0730e3f616abd133a302

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