Malicious PDF — malware analysis report

Static analysis result for SHA-256 e899490020bd0c54…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 18:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17b3121c96cf66a215f5635895952d1b SHA-1: e3f04d354b39580fbcfe71bac7df265e53ae1fa2 SHA-256: e899490020bd0c54a38e310fa93051e2570d0534d53588d3d61f7a5b60bd2d80
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, directing users to various domains, some of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=cheat+car+parking+multiplayer+money PDF link annotation
    • https://plantbiochem.com/ckfinder/userfiles/files/pakalijunir.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-11/20210911033144963986.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/20875333535.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/kugivogipupuzuxavasaken.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/41897999260.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ktq9fu5l0gsrn8od7lvj16hf18/16441567137.pdfIn PDF document text
    • http://gdgom.com/upload/file/210924043418490506x06m92y1f5r8.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/dopavofovitufodewirajuwuf.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/fefukigosifawikase.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/2991448843.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/65758763499.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/79470357906.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210912124509.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/91511945037.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/xulovodugiluzukavew.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/dojatejefeb.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed70345828---68187536532.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/85445778811.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150615727ace---buwefidefo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134cb636816d---85401224089.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_off0000ad43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD43 10988 bytes
SHA-256: 14a9312dcce9435af9b930c92dd97fcb4b03a53c5191e05aeff562693dfb1326
font_01_sfnt_off0000c6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A1 17536 bytes
SHA-256: 143a6d318d436685450b35eb42e352c1e3e1a6190f775b0eaccd11195154311d
font_02_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1