Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0aec19fafc358c0…

MALICIOUS

PDF

73.5 KB Created: 2021-09-09 11:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35b1702344cc8d1798778a465f957946 SHA-1: ae2f701d88884f2e3006ad2fd3f47c41a011a4a4 SHA-256: a0aec19fafc358c0bdf8a4da5eb4c8d7b42f46fd5d3290d6e0c516d2b75c054b
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external websites, some of which are hosted on compromised WordPress sites. The heuristic firings indicate a link farm designed to redirect users, and ClamAV detection confirms this PDF is a phishing trojan. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132646bbe45c---dadovuzewimorux.pdf In PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/49669784303.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613040a0830eb---71024800473.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/nutikifopisude.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/kafagurelujuxav.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/sexevaputetewowefipoju.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210906012002.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/solawulinurubizitobupele.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/c91vpq19p0at0l8an6rkulv48g/23367084870.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210904_F20A7581646354D6.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/25254031232.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6719gfrti20i1ou30chftvi573/rumisevunupef.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/fomologewiwa.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/lusijovuravaf.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210901105243_v0hhie.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/vadizul.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/mujutavevitaweto.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/5210424055.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210906161709.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/98341269713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+trial+free+playPDF 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_off0000c0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 10292 bytes
SHA-256: c4d3e4af2f575f72bac0bb96699a3f08bdd8e96dfcef9f5ff193234d6bcb6990
font_02_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 16232 bytes
SHA-256: 556dc639a7dbbc620a76042023a61c729d88d3cfcda44a7c1e6771a1c5324764