Malicious PDF — malware analysis report

Static analysis result for SHA-256 a032288795470145…

MALICIOUS

PDF

90.2 KB Created: 2021-08-13 16:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 703e0dad0457c51af03e87423ca44980 SHA-1: e17782004d8da2d304302cc7eac0cc31720ce8d4 SHA-256: a0322887954701450bc5e84481b49a25b39b4bd89468bdfcd96379990a8f3471
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or potentially download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO-poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wastran.ru/uplcv?utm_term=tekken+3+download+for+pc+windows+7+64+bit+free PDF link annotation
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c58defe1---vedoxubowufosalifasabup.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/10778595377.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/1bff9071ac3ec98a688a311c0e9882c5/58397825620.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/xevaranoj.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/8594780726.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/80d42e32965c36a682a9ffdd8cde6cf9/nukoteliwa.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/92b5f5525b67c0337502648353afb7ad/5349104378.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/fizasuwebomapem.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/bakujoxarosobubarilepaf.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/61759037980.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/94452870488.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1850722fb9f8b33bf1dd7ae981273eac/66288560755.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/8995f25d6ef3c93846ccecc5c451e130/nojaw.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/22136635265.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c37928663---18559294902.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/32711543923.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/07-10-02-36-33-69.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/15534523879.pdfIn PDF document text
    • http://dianthusindustrial.com/resimler/files/60656970111.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/383016a9a1c1325f465de8bc2065456f/66959442751.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/dotutakexujogosuta.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///vororanuker.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/1409614323.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_off0000f5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 11360 bytes
SHA-256: 3d38baa08448e24dc889b276f4d8b335cc987e8f4ea5d62fb43a9c681bf88d52
font_01_sfnt_off000110cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DE 18624 bytes
SHA-256: 0e39e0d5683adacf2a923a1e50da1196130e1c59634053013491742fa0e19eeb