Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa47c2ce806d48b2…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 05:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4657256ec0330f7147c7beed995144d SHA-1: da6fe3e8a93b7f199861c4f8fdffd1ac9bbaf2de SHA-256: aa47c2ce806d48b27d9844f506039c3adcd56c2d5a80cae9df2ddf9e5be0bccf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting it's used to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is part of a link farm strategy to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://inwebjor.ru/uplcv?utm_term=moto+e+operating+system PDF link annotation
    • http://urs-certification.com/gais/image/file/5390374214.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4b41c252---lewoxevoxerejovaduzulali.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/noromenatabafiguvob.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210905093548746102my47j3navv6n.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/fusodawijupu.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/10760987505.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210903185903478890kr8cg.pdfIn PDF document text
    • https://dacola.com/upload/files/14891309059.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/10061006998ac9f0444521c6261428fd/kapidatotesireke.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/89320053408.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/pegerixodajijudopi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/40483171532.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/98952066609.pdfIn PDF document text
    • https://anjingliar.com/contents/files/topedu.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/xorod.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403d1b6434f---naxomezolazatajivugofu.pdfIn PDF document text
    • http://spiregene.com/image/files/20210914_115704.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_off0000c788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC788 10656 bytes
SHA-256: e9ff75e816a28df9726203ed94aeb4d53e97476a21f9b8a67b2fbc9deed571b1
font_01_sfnt_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 17692 bytes
SHA-256: 8c82b08e87d15a7ff49bef24abd9931fd0dcbac800babf65b3014cdf1434e0ee
font_02_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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