Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4f6ef73453a097…

MALICIOUS

PDF

88.4 KB Created: 2021-09-12 08:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 702f32bb41f5337d77e1812666d5c605 SHA-1: 053c5ccc7a7da75bb54024005979a830eaa78959 SHA-256: db4f6ef73453a097551b54e0caa3151dcdde067c46162db1236ac4df7a728e65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://drafthe.ru/uplcv?utm_term=kodi+android+tv+apk PDF link annotation
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613304b960838---bobodexanodajo.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/liwawilo.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630553384.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161368b931058d---tufolifutuvidapif.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/xopabosujimodirevixinixel.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/93773229853.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6ddae40e8d94563b7a91f40551559628/49635887603.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/losusuragawanuvex.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/62334514148.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/42782257105.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/xonokepavokidefazonaxi.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/78834336556.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/22455222101.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/12824759496.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/55842999208.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/pugaxitapasip.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/baderewasebapijirituwi.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/41023517052.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/guxetoju.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/90292337711.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/gosujenasifigubaleserobin.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/83742431228.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/1441295098.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/21019064132.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/79531155135.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_off0000f06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 20412 bytes
SHA-256: eef12f0f071cd3a18c449f44cd9192110cfbee8056c3b7b14a99c4de7246ddc6
font_01_sfnt_off000125a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A8 10188 bytes
SHA-256: 004499383e358f87ff0e3c05c460d9f200239249f2afb9eed5afb551fa0e9548
font_02_sfnt_off00013c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1