Malicious PDF — malware analysis report

Static analysis result for SHA-256 71dbdcf98da5e46c…

MALICIOUS

PDF

93.5 KB Created: 2021-09-22 23:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65fd67578c0f864edeab9541e9074e07 SHA-1: 91c2a7e1ba173caa1924592d876e5d4490dd2905 SHA-256: 71dbdcf98da5e46c771f9e6b500ddcf66599e88d554d99231162c5ed582948e8
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous URLs, many of which are part of a link farm hosted on disposable or compromised domains. The presence of these elements, combined with the ML classifier's high confidence score, indicates a malicious intent to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pixomot.ru/uplcv?utm_term=call+of+duty+modern+warfare+2+xbox+360+torrent PDF link annotation
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/ruwimafasijumefimuto.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/9120089377.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/74483253716.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/jeturopewodazof.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/rajosof.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb1c1c2331---roselemiparedazozej.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/vogarato.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/91990947208.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210919023107.pdfIn PDF document text
    • http://mobil-tech.com/files/pigavebametal.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210914085157757618ulh1hk.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/puvoximorivi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bab072026---88884329947.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/50773074304.pdfIn PDF document text
    • http://didopack.com/files/28754031231.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/23965747111.pdfIn PDF document text
    • http://tianfonmm.com/d/files/bijivupifuwi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f970644160---zezomebisalogupozenoforel.pdfIn PDF document text
    • http://briztravel.com/upload/files/47455888405.pdfIn PDF document text
    • https://matricula.arendic.cl/files/muxexozofow.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_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 18328 bytes
SHA-256: 878d5eccbb857590d44c8a86223df8568f2d84d01030b796c25453c37830f454
font_01_sfnt_off0001359a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359A 11412 bytes
SHA-256: 223d279f5053bebcf83974eca7b8ae8982116e2f4e6e3ccac647e64af9a8ac43
font_02_sfnt_off000150c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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