Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1796cd3f1bb6036…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 08:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a991439212d08b1a763ecb0b49d1d96 SHA-1: bcbdb75a5fbb9f3aaa6b61eb0ab32fc3cbbc24e4 SHA-256: d1796cd3f1bb603635fbcb677ed912f79e234c1de672ab061d57e3cf71b2db8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and is identified as a link farm, with multiple heuristics indicating it points to compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript stream is a common method for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allnatureint.com/userfiles/file/24138495936.pdf In PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f7f59301212234bae70d88eb18c5eacc/78892357279.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/kefotufogizebewuvodu.pdfIn PDF document text
    • http://nemalipics.com/rozefav.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b6923ceca---89469404308.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/33714858623.pdfIn PDF document text
    • http://ubest.ru/images/file/58703969793.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/82ad7342d2909644171490a71cc08986/73375541231.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/witegerupudigobof.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/80901504413.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/lobuzaxafuzef.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/rivuvizebaz.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///nepajulifawuwe.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608350106b9a1---xibaxigiliwig.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/zejerovurutep.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/fedenewoj.pdfIn PDF document text
    • https://wrd13.com/force/file/dukosuzerutudamimokuvune.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d53dfed481f626c72ebed13fcee3eb9d/34736154036.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16096067192e74---59772072704.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///kilibivameziwovalularera.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/71858874231.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/35887063575.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/08/202108211816465829.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98875e8ecb---95617308417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ugc+net+paper+1+syllabus+pdf+in+englishPDF 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_off0000df1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 16792 bytes
SHA-256: 25471a665211c4833bfcae424bddf80fad84046b47ac7cfa88fad4c29f05c2de
font_01_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CF 11192 bytes
SHA-256: 8ae4e2635746ddbdbd0bf6abcab9d81dff8081d2d3a84a4598012653399bb1de