Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a2b16c785b08ca…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 17:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b74e83b0cb751bc88d22004c7a346a49 SHA-1: 3dfbce33df6383be79313a0691fc9f3196a95488 SHA-256: f4a2b16c785b08caf584fe5ea3b290784e1e3c57bf154b91e64438a1e225a83e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. It contains an image-only interface designed to trick users into clicking embedded links, which are hosted on various compromised websites and disposable domains. The presence of numerous external URIs suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=promising+young+woman+123movies PDF link annotation
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f074abf5ca---19851736211.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210919040627.pdfIn PDF document text
    • https://estoniapools.com/contents/files/43379488241.pdfIn PDF document text
    • https://cope.lk/assets/media/file/63809727412.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/31945612745.pdfIn PDF document text
    • http://3m18.com/images/editor/files/tanexijoluretanodusenem.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/37575580623.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8eb1808df---6928352170.pdfIn PDF document text
    • http://travellerisland.com/files/9675707141.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/vavofogiwa.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/somipenenaboxin.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/wakobaverukebas.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16149b21c35f27---turixibupetijepa.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/058457656ccb7d1b02ce3f7d566dce99/74508600077.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/98854709658.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109211241384831.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/dosusijetok.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/bufojuborukudonijiku.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/muwezoxifeta.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/vexejonifupewuxexab.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/43026926200.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6143d3d33e034.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/19232660310.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/vobokiwe.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/93636288261.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_off0000aff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF7 14060 bytes
SHA-256: 6c5a804fbf0f007758b70e92947b3fb93147d448513589762b7c2337f47beb72
font_01_sfnt_off0000d330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD330 11016 bytes
SHA-256: d4214ca5998453091f7527270f4897e262a5c5bf85461bbcf687e5ba55f7361f
font_02_sfnt_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1