Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d7fee1a26f098a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 03:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: df9c1620826a49379ba97999b5741275 SHA-1: 761f473b79b39c887a9734026ae45fb5e8de1c4e SHA-256: e4d7fee1a26f098aa63202a6c5e263d0aee3563a84730d4a34a770e73cc3b460
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to external resources, including compromised WordPress sites. The presence of these links suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://samowar.ch/upload/file/deguviselowesuzepagu.pdf In PDF document text
    • https://usssecuritate.ro/userfiles/file/xanapalofoperudovavatojaj.pdfIn PDF document text
    • http://horvathortho.hu/tmp/66592679724.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091215183873499.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/46076020983.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/18365047834.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140856364953---wixawoxizevatifon.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd28c21812---3630317052.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/patipiteliwivijigonuboz.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/18hsfdpoh7i5ag38p1tp7vv2bk/9756266437.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/lowupezuvile.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/fuputos.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613094231b6cd---tosifemigakuwagokikuti.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/34730663412.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/72d3540979ac84575606596237a1e7ae/jolebuwefifavukilodel.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/mokel.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/remanilejisidivupenefas.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614118ed527e7---faxajiginapalemugegobok.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316baf6e2b9---37594989039.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/vukibebudiza.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137edf103a34---49250052873.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/5568000831.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/wigowogaralazik.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210916060728.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/38153738818.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161419903799d7---86996086070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=panda+gif+funnyPDF 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_off0000d0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 10080 bytes
SHA-256: bf49bde91d946a581c74bb1a345b0254fc93a43cd7176c81fbd1f0415a6d9fce
font_02_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 16156 bytes
SHA-256: 5c3047a512cd7fd0fdbb2ba6455428055085e00fe7b9785999a77985a0825bad