Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b728e0ce13fcabf…

MALICIOUS

PDF

106.8 KB Created: 2021-07-19 15:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e8a88ca9acd794502c678536fa9915d SHA-1: 646795d52cd92b73b427d0fb00c38fe1f1826dd7 SHA-256: 3b728e0ce13fcabf7e83db679cbdac71c108af1eb12ece7aaa47506057503d94
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 compromised websites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest the document is designed to redirect users to potentially harmful content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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 http://sicilyontable.it/userfiles/files/51837717289.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79a265d6dd---1262407526.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/9faht71noadlgb84qvd0j6t9ek/41160029366.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/5aebc5a9f83f4e9ec4726cc88e05e11a/26200002677.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb41abe91b---bejoparevedomage.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/naligowub.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/12ae6ee63377a7e5dd5fc6590a00fced/madixesadejoxegogodezigad.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/vuzap.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/dipodapabosolusogalapaxaw.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9e5837bb4---56068118501.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/fc14e4c81a7d552e256037db3afde335/37701841615.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/73410b22134294c9f60d6847097ddd02/silifexu.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/belef.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf03028575---40834102535.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec4906fff9---pudezevonumamubise.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2142f3dd6f---warer.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/kogepemudukijazavex.pdfIn PDF document text
    • http://nktrading.qa/file/files/19420598204.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079de6180dde---muvuzazazaretawizirizi.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/gs59bp6r4famcjgqcch3h3oh66/zotirusoterisuzonatutux.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/64972323388.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/f5ece851cb00c5b0d915ac9bf3284bab/milamebomizaloweri.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dezafawipemejene.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/vegifulosuvek.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hh384c480v7p8vmjvrcdsu9if4/52951074518.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/gudamimuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=quotes+about+fezziwigPDF 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_off00013f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F37 17520 bytes
SHA-256: dce269b463b53b2e957ddbeb72c992c8e29e0a4482c068ab49fb1990612b0ad5
font_01_sfnt_off00016d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D35 10584 bytes
SHA-256: 4b9d2db4de4e7ebc833f991dd9cb8737c25e23171c5e21891bcfe7934bbdfa38
font_02_sfnt_off000185c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1