Malicious PDF — malware analysis report

Static analysis result for SHA-256 38445612fc48274a…

MALICIOUS

PDF

89.3 KB Created: 2021-07-03 02:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aafb66063c87b0c079a6c5cd2f722847 SHA-1: be48264cf4b21058c5c5816fddc1390fbf096bed SHA-256: 38445612fc48274a56adffef339044ea57af2001abe5ec28b7204760aebcf3a4
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/cc72804819dd4b9e05d0bfd649739d90/77440193044.pdf In PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/icf0ndfilpunp3bndksjse996b/54922452800.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/1bf911b0c57c4e45e00ddee365ebfe8a/7170077428.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb21d4b3cb---lumopisevegoj.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d786843af5---5183686645.pdfIn PDF document text
    • http://altinay-law.com/images/file/tixubirovegozimojorapinun.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/mapol.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/176b0c4a12650841905562d59332ee91/binixile.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/d5d3pt6bmo7gebp3aov5j8e4t3/44690195309.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/30ab0e2b67c6d35604b394c126ba741a/nodutikoxom.pdfIn PDF document text
    • http://flirdining.com/uploads/files/15882076451.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/9kkaprmtadvjd60d0libqvuvr5/zesegowod.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/61230018272.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d3037635786---wufadutakujaj.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/puqbms8etfdtfehiqvbedvuvvu/95542610146.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080d7976baa3---39349653045.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/la23p3f8m6scb43atu0va0lr00/mulutivuzuxuvamubitulog.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a7bd5bd52---tugesate.pdfIn PDF document text
    • http://charivne.info/images/file/94742966923.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/89210420617.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/wabiwuf.pdfIn PDF document text
    • https://fobh.net/userfiles/files/83377596261.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/6af160ee54b5704cb12b13d95da3acb8/52088570718.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/770a9591f2ee34121a709be57ea07956/kadur.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/k5gg46kjah2s0r21j7m4i28647/vinikexero.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae8a7e8c5---41263182533.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf6615084b---gorawidoboroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+convert+pdf+in+dark+modePDF 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_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 10804 bytes
SHA-256: 2a341df93ded74e054ff58b7cd38d29346e18b59f8826df106839859c8f896f4
font_01_sfnt_off0001111d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111D 17540 bytes
SHA-256: e7fbcb11e62d641ae95a74694404af7afbb4cfc3543b3867d9c1b1a12799d3a5
font_02_sfnt_off00013f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1