Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15ea8a1fa0d237b…

MALICIOUS

PDF

74.1 KB Created: 2021-09-26 13:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82180729254773ec67fc35da9f6804ab SHA-1: 762371aea9873f58e8149ce08ba557bda842d77a SHA-256: d15ea8a1fa0d237b102c8b8561a252ff58ff7d2b1d85a746f949257b1e7c0ec1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, directing users to various domains, some hosted on compromised CMS uploads. The presence of external URIs and link farms suggests an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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.
  • 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=ultimate+ninja+storm+4+apk PDF link annotation
    • http://romento.com/uploaded_files/userfiles/files/33225473221.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/nopebebazavufo.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/tudivamonigofalibulupiwi.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613265441d479---sazixuzixadiwapupugow.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/wewibexusumetidadokujufif.pdfIn PDF document text
    • https://garmin10.ddbseven.cl/userfiles/file/nixopunamomokozurolewumi.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/18260589083.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614afe54d3626---39653563396.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a923ea6c070d5de3f1a6a98e53242fb0/werodezozi.pdfIn PDF document text
    • https://olterus.info/contents/files/segudanasarumotakofeludi.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109060614333994.pdfIn PDF document text
    • http://palami.by/images/file/23789747484.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-26/20210926001638475731.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/nebudulujisi.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614fafa8a8b9b---65506560765.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/3886489401.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1be5fb3564e3a0bc7ce134bf41bea1c6/towejepidewadubipoge.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e470acfa33---22686996127.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/genefu.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/jinafimenisosajomo.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/7d931cceed48013615317d4ac0e73fe2/4565903478.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/85079153779.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/suwogopiperaxovudela.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/mepumexaridutezebara.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/vesodom.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/vazufasovugupabi.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/73158703539.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_off0000bb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32A 10720 bytes
SHA-256: 079543cb956f76b7484aa70ec541e5112a490d75d034e477f1fa67a7f273dbfd
font_02_sfnt_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 18396 bytes
SHA-256: 2eca54fc1c32c46831a7fb7fe02b76a5b03e97832e1af1d5422c678c86db9be5

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