Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb61e6999da2077…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 09:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 703d496709836e8fe8a281ffa1dfc97a SHA-1: e0b173b9cf1796b3078270741ed2b6010a5a096b SHA-256: adb61e6999da2077c3ffbe215e6885d8270cd32c64d42215394f04800389c91b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites hosting PDF files. This pattern is indicative of a link farm designed to lure users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://drafthe.ru/uplcv?utm_term=azure+az-103+study+guide+pdf PDF link annotation
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/09683f5fc894f87b55af267f45d2658a/gudizuf.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/nawojakopedizofuni.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/8kgvvhpick79fnlmq395ocm6di/55359361264.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/88172737624.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/jagugekigumit.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/sukugebevud.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821197c36a2---kiwiki.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/5b30e8d714c0eebe50d51d38ed1be8fe/38137089197.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f263fd1c2c---59132281979.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d6573656---demovowit.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/powajaludozuzaruj.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/73riceku3ulrbbbppts5q60l62/xemomirigixi.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9659f0b14---43821950292.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/laxosefutibesepamevides.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/jaroda.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/r2begvhno36d366jb5f6t8in43/73764655564.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/66716370682.pdfIn PDF document text
    • https://lesura.net/userfiles/file/54332439071.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/nirapuredipulutawigopuwa.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/17697965152.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/wozikiterojovub.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/momepiladijuzirenuzakoban.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ag792ae3j1pp86l6fnbn3pl7f2/14449650697.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/14593110378.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/br8dd9rir1todiba9f8p1l3qv0/gegunibabatuwejutibefava.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/2q7n101doq2l901bkku5epd135/jiwenizavobozojubogop.pdfIn PDF document text
    • 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_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 17656 bytes
SHA-256: 0a5f9431704ab450946682aaf4bac01c73e5d22f0cb2a3ddebb93a96e318744b
font_01_sfnt_off00011247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5E 11040 bytes
SHA-256: 8f7de97204651955d593ce3a7b31ce0056820e49261adef8ac38251bc4f7e805