Malicious PDF — malware analysis report

Static analysis result for SHA-256 2807103b7dd387d2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 13:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41f5d1b4a3f5286556a1776555c4dfa0 SHA-1: 74af221049655a00c4062e64f02715dff4ceedff SHA-256: 2807103b7dd387d2e62f6b9299f3a3f90e5097469f5cccce64c7fcfa687007ab
176 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. It functions as a link farm, directing users to multiple external URLs, several of which are hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the heuristic 'SE_QR_LURE' suggest an attempt to trick users into visiting these sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://drafthe.ru/uplcv?utm_term=android+9+pc
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b2f8d9354---35410102181.pdf
    • https://liur-krd.ru/userfiles/file/36216008768.pdf
    • http://primeasset.hu/fileok/file/fipazozepaworofegev.pdf
    • http://sporteambiente.it/ckfinder/userfiles/files/90771523406.pdf
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/72194353417.pdf
    • http://casaledellasignora.it/userfiles/files/97392147252.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161418597b2dd4---56962256726.pdf
    • http://china-engine.net/ckfinder/userfiles/files/89271779561.pdf
    • http://dongkoo.com/uploads/editor/files/xeguwexumow.pdf
    • http://progettogeometra.it/userfiles/files/suwagitulenivolek.pdf
    • https://heart-calligraphy.com/uploads/files/202109070244138645.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba253be070---fupedanumata.pdf
    • http://hamkr.com/userData/board/file/rupijo.pdf
    • http://ammk.sk/userfiles/file/vagevijedozigov.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/4d62950785c8f71005647142b4c3ba41/43967784737.pdf
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/48267321187.pdf
    • http://topenglish.sk/app/webroot/gallery/files/fewaderugusaxif.pdf
    • https://abyway.lv/images/ck_images/files/woxorowobabuxo.pdf
    • https://barcelona-health.com/files/galeria/files/tulowurise.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/09a6aa176261b0e2b1140149864319e5/87653966215.pdf
    • http://kochamsushi.pl/UserFiles/file/loxotuwozevagizub.pdf
    • https://hkpefa.org/editor_upload/file/45096954397.pdf
    • https://lifeteacher.tw/uploads/files/202109092229373926.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ec31ca560d28948004ddc58d478f1f5c/50551317217.pdf
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/xixewujetugobatatitu.pdf
    • http://agierresrl.it/userfiles/files/xarubatevu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 16792 bytes
font_01_sfnt_off0000f748.bin
a10a865bed3b3afd57b8fd73977d6de482ba7b4081aab6820a041a24740233a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF748 18160 bytes
font_02_sfnt_off0001263d.bin
c4c3e23dc888fa70fd6cbe5358385dc9e76ad9ecadd88776cd1b897470fdca20
pdf-font-stream PDF embedded font (sfnt) at offset 0x1263D 10048 bytes