Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8ebbe28e59c214…

MALICIOUS

PDF

71.7 KB Created: 2021-09-22 12:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cb98958a8be831cc2624ff36b67eebcc SHA-1: 7108357d36044162b502db8a2863ac843c3f378f SHA-256: af8ebbe28e59c214b0d7690999ad1f5900cca11335959955060df63090b44019
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://krasneclanky.cz/uploads/13769110944.pdf In PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/23004471040.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404d04d6d05---98562254233.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/kelitevujifipuker.pdfIn PDF document text
    • http://soc-in.com/data/media/files/witor.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/90142365112.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0a6a1c247---95875708024.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/labojifafukikujis.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/94350715337.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/4189860092.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/53150276809.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091813075673499.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/vufubasugupibukipo.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/37128803019.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c108bd154beff076d4629126058a40b4/73999943905.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/peleginij.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/pilajikometetodatiwo.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/vokaxozugikomum.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613521b3603fb---46671146681.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/7tqequ6qcuarve8lti6ok1m1dt/mofigabu.pdfIn PDF document text
    • http://18554080.com/userfiles/file/tuwunuripaf.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/xigifem.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee0431c1f208dc0e961f7e2e0cd4a927/bixodariziketaw.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/pukipizijibotafumupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=screenshot+android+kitkatPDF 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_off0000b876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB876 10588 bytes
SHA-256: 7ad2c3a78f2b9b9fac0b5a4be366ea271d753f56262b5874934e2567967d918f
font_01_sfnt_off0000d089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 15916 bytes
SHA-256: 7494a9a4ccf620b490d72662ee9e3a286e86c40e3c1249a1380f983e9923ff5c
font_02_sfnt_off0000f96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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