Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5cf2667cf25f35…

MALICIOUS

PDF

71.7 KB Created: 2021-10-12 19:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8e168a7047631b1d450cc27df6946c2b SHA-1: dae10c33d51b59f0d1d53cab50b472a1fd0b6f79 SHA-256: 0f5cf2667cf25f35049e101f5299ef0ba4d751fa12a5dcb16e9e7188f2b9aab0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and potentially compromised hosting. Heuristics indicate these are used to redirect users, with ML classifiers and ClamAV flagging the document as malicious, likely phishing-related. The presence of external URI links and link farm indicators suggests an attempt to direct users to malicious 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://chcial.ru/uplcv?utm_term=theos+sector+50 PDF link annotation
    • https://wodepcb.cn/uploadfiles/files/nofuxekamoverot.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/59923523799.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/wuladedegibitijexud.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/pamunilimazulo.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16163ffa93d3d4---zawemigajobupovos.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16162c71d54556---12027856892.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/35829589624.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/kumogavopotutonuzuvu.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/41077769933.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/81591366843.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/24550375449.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/22257209975.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/95549402925.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/57389561673.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613027714cc8e---levijelirutuv.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/69644172773.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/96620016624.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/jugonezaripuvulonek.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/lukemuzad.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/51933700491.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/57496724077.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/69466006987.pdfIn PDF document text
    • http://emeat.ru/var/files/wonarajeg.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/ligabuwowiw.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_off0000b665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB665 17384 bytes
SHA-256: 220da13fc183a53a09773dd9e9312d9d180dceb25b8f7ec27b686c1619eee3ff
font_01_sfnt_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 10144 bytes
SHA-256: e4487d5d0f03f142994488f3b5fed931dc967b54a3949e29a552f3ffef693829