Malicious PDF — malware analysis report

Static analysis result for SHA-256 698fd6bbe78826ac…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 15:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 410a4057f12516ec2ab750558b902860 SHA-1: 89638acf11a34044c8ad0c573e12ceac5e1e6b0f SHA-256: 698fd6bbe78826ac0f2cee6801d86d96a7f66f9f108d84bec2d2120db55effbf
204 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document instructs users to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://krisoc.ru/uplcv?utm_term=suspiria+streaming+vf PDF link annotation
    • https://tigapilar.com/upload/files/38706758985.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/44188212521.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/xozidobikelu.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210915160305.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/kijoragaval.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/41128634763.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/41943565099.pdfIn PDF document text
    • http://innotack.com/userfiles/file/xesaf.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/83658323162.pdfIn PDF document text
    • http://thevalleytrader.com/files/42440727089.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/masitoxomumikitonulok.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/89936278481.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f8831726---76085324599.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161354145cc717---nulisafelure.pdfIn PDF document text
    • https://salwangurugram.com/files/sufekeguredaluze.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/bevupogan.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613516ac13a14---77706242062.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161337972e107b---99832322162.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9b1f8b7a6---mebamovigaguxav.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/6698678236.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613735956693e---zifajevegixitizag.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/zidawirinalopibot.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/toniwavusemutoriwapuj.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/54684344957.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/viwiresitipiximogig.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_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 19076 bytes
SHA-256: f457c7bd7dbc8cda54dee59109dfa04b09a12ee42fdf546c723bd0e56fb97711
font_01_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12184 10776 bytes
SHA-256: 938e1762e3aa10a130ad07a5812a4c1ddef5e9848263d121d46b4bcf268e34a1

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