Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdc186778c12600…

MALICIOUS

PDF

112.0 KB Created: 2021-07-20 07:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0a4c016a5d2b35c9da8c4ce1686680fc SHA-1: ab498c987bf0755e8cb1dfcee6a68b9727944fef SHA-256: 5fdc186778c12600b06470319485307998913225b03955849c37ddfc214abc91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these rules identify PDFs used for hosting malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9792

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcc2bc3ec5---zexelalexedeposanojisenab.pdf In PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d370b2ecb---4629659789.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a88feb6f8---49128621818.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/wegexunezerewusuf.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1g7clu1bic2rpmnkmmc7lttjh3/kipalapidowenobikalop.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/perurirorekekamuxo.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/rekulilunukebigunerolo.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/dazusanowutibasul.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/bopukivupixepepezixubam.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/69336115350.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/eeafba4d032546bca72aabdde14c1e76/jofutasofixobodezotipora.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/80112d6e964049526cb42489ef5e3439/87075647928.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/15380901287.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/44302965107.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/bee430bac1a1132c080a31f5604f0f45/65966849322.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/vekabariposav.pdfIn PDF document text
    • http://cwesp.biz/upload/file/nelewefigixuvexalujojako.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a11d0716dc4---xobuvatu.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/nibamiwujo.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60097721b6---25998854606.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/24881669093.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/11197732983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=veer+tum+badhe+chalo+poem+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015ee1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15EE1 17464 bytes
SHA-256: 08311215c13004d8b3375201e7a4fb9a5fe7d2cb3b905c5ff8e1481492218834
font_00_sfnt_off00012228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12228 2660 bytes
SHA-256: 06e26102258a6c389d428e70ad7ef2c5fc8d0d80f2963175d29e8ceb974b89e2
font_01_sfnt_off00012d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14566 11172 bytes
SHA-256: 02db9152c00739a16124612bb2168f28a8599686f790e954d53153a5dc80c5a2
font_04_sfnt_off000178e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178E1 22284 bytes
SHA-256: de92e3d573949ce5a72a62b49623d4e19ca9455426c2ffa8459fe9b6ebcb64f5

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