Malicious PDF — malware analysis report

Static analysis result for SHA-256 02738ea4ef81f027…

MALICIOUS

PDF

74.7 KB Created: 2021-09-24 17:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 754911e8b3fdba36e004775ac634d999 SHA-1: 66b00599eb856c855746357172bff5514c52b8db SHA-256: 02738ea4ef81f0277e9c30646767b72559ec97a754cde0db4906620251dd250c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to hide clickable links. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 74 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 http://veterinariacomportamentale.it/userfiles/files/20768119277.pdf In PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/benogibutetabunapuwagoma.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/84067779922.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/kowofixadaxadabu.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/80153828407.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161484ea186807---bavojuduxav.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/43045dd60cb1eff3b93d6970156e4bd6/76964613757.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/38824195107.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/jiwanulile.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147cfefb430b---wisigazum.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/kigabobatoxe.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/pamaki.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/89923991267.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/79862976262.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/sokomebiromax.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090909025873499.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/loropofakuwajojadenesug.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/towerosositogitegurizesad.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/kiteropot.pdfIn PDF document text
    • http://rabwork.com/media/file/piwabokisutulafafisitajoj.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/23486443882.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/ludarodibozokodirumaxokuk.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140829a793ea---kogezave.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/jujivototumofan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+photo+recovery+apps+for+android+phonePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB8 10904 bytes
SHA-256: 24f86771cbe89fb21ff16ac16a772f32b1c45e05cb82c97a90c9ccf715d8629b
font_01_sfnt_off0000c8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FB 14236 bytes
SHA-256: 05978aaaf8d2446d727dd6abee9baa93d168834fb24125ef2921a2ccbb526509
font_02_sfnt_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_03_sfnt_off000102e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1