Malicious PDF — malware analysis report

Static analysis result for SHA-256 9538d4bb0e68b0db…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 00:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6e42f3cf67faed0537f649d86fa533ab SHA-1: 7bb5f4aa225ec140fa6f21f4ee8c0aee476a9d75 SHA-256: 9538d4bb0e68b0db6e3e60e17d4ade47a35f7b7b07baefd6be4b04b051453229
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. The PDF document itself appears to be obfuscated, with the 'DOC BODY' section containing unreadable data, suggesting it's designed to evade static analysis rather than present user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=haxm+device+is+not+found PDF link annotation
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/numokikugiwodudutoni.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/gusejipazapekokesi.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/diwosepevixeredaju.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090313114173499.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/17741012795.pdfIn PDF document text
    • http://tyextractor.com/d/files/ravirajisugus.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/71789416199.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/57807620536.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109011653586610.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/liwenawumikeso.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/bered.pdfIn PDF document text
    • https://italvaping.com/file/40827145927.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/51341307243.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161392a68b57cc---dozowobem.pdfIn PDF document text
    • http://chanassociation.org/uploads/file/73078445513.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/57351205028.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/filusojaje.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613591632c991---xakokugerewimolijalode.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/kagorugiva.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/26173702032.pdfIn PDF document text
    • http://espokebar.com/uploads/files/95246019942.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/siwijumuga.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/88656513838.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e378abc36---11894270971.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_off0000b758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB758 19848 bytes
SHA-256: 243d6b435f74e4e8382c2b669fbc5d297642a3ad255d2b4fd082a024dcae18d7
font_01_sfnt_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 10748 bytes
SHA-256: 92602308a18989fff1d77200c8f91b43decc14b5c72b6ba383c0bb80a7231f94
font_02_sfnt_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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