Malicious PDF — malware analysis report

Static analysis result for SHA-256 31106aca24270db1…

MALICIOUS

PDF

83.4 KB Created: 2021-09-08 10:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52d32513f37cfa2b0d07de6826936eb2 SHA-1: a0441075193abaa9993d2dafa30aa71acbca271d SHA-256: 31106aca24270db18ff7a078535d93bd78d600a7c9de6e7cc27a5fdeda070a34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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 http://ahlhy.com/uploads/file/051812485688.pdf In PDF document text
    • https://rotitelor.com/contents/files/katemunodiri.pdfIn PDF document text
    • http://cocoal.com/uploads/file/gopenosonegirenizow.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/pr7cg5k9pgjum4vthij4ci0r6l/57224757296.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/68589632510.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/sutamapifesesudo.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16093e4da7dad4---39334214223.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/44237842528.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/latv0up9j29jc01cqtln8u9j60/mutakun.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612d6b4faf9e5---71541756249.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/0929132c6e94bc11a65ac7fe7d22222b/3441883361.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/99535039610.pdfIn PDF document text
    • http://weingut-suppan.at/files/18901485679.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/eb44bdcd49d0e6e1a229c8bbe6a3daa5/bamenaru.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/dopalekujinu.pdfIn PDF document text
    • http://vce34.ru/attachments/file/26996763679.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/rafanoves.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/bilolituzojon.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/57434747264.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160719bfdb88bc---53507200766.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/sezotefobuguv.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/zarofoxazijigebeliriwana.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/liputufomatoxujisunotu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d9b13cjt6jvfrorebkd3sq3984/93483791951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=recoila+hose+reel+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 19528 bytes
SHA-256: d2cf8b97d696105d3e719ad907eddcbdb9eb612d1d5efa9eb5d8381961d052a9
font_01_sfnt_off000110cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CD 10540 bytes
SHA-256: 3f0f6c9ba4b75b79ec71db3c3baa848f33f34376d8530980084d2025ae316008
font_02_sfnt_off00012893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1