Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede19136679ae5c9…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 13:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 65deb2de3342f7d8365369fa28f829fc SHA-1: 69f10d152696f3d4660d75017e13b85390db88a9 SHA-256: ede19136679ae5c98281e01d87455c21dd6dd3eddd5a3c8747ae15d1e6d18815
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=ekg+interpretation+basics+pdf PDF link annotation
    • http://hotechike.com/files/files/47273907880.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/rugafajazela.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/01ed4fe3b937dab8a1eba4ca8283861c/fuxapadimanufufibojefevu.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/40374677295.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/soposuboke.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/tisobisisitemuporabavufar.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/8372546733.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/36484086185.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/dukuvenefubirikewela.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c47539c8ad---jatuwazawewunes.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a2l9h68gkp29h2mofoanl0hq86/39735904010.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/bafusadulax.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/79657505995.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f97c2555ae---vijirosuzanorobezuxeko.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098527a0bc5c---tejaku.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d963373ecd---8079625454.pdfIn PDF document text
    • https://telenovella-bg.com/files/gulatagose.pdfIn PDF document text
    • http://standdominica.org/files/files/60163814550.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/48508770772.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becad8caafd---17495476966.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/eb81f5edff21bdc6659c8046d6c40432/tipeputafibiji.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/e2c6165b44be124727bf51f4aaafa9a7/rupiz.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/galutuvonitexurori.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lojorosaremok.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf90ceade0e---nezumupiritotosase.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_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 17648 bytes
SHA-256: 27f0ec7f4003e7c4a9886582a8a4857a901f033bcf0e12ac60d2587ee15a707f
font_01_sfnt_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B0 10964 bytes
SHA-256: f32df16947b4eebac6cdefdea74e7a4fbd104fa5f4b7ad1182d0800d9ebeaa1f

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