Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe8e3b44fb43c17…

MALICIOUS

PDF

88.8 KB Created: 2021-07-22 11:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8ea1d339415d9b2b5ec9f813ef2b5aeb SHA-1: d508605acb1722ee1c0c8b9f7fd8496acc73f849 SHA-256: afe8e3b44fb43c170f8722b5dd2444a59c6667794bb441afd65bfe112b0bfb96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve as lures to redirect users to malicious content, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://markmont.eu/editor_uploads/system/files/40486607705.pdf In PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160821cfca6da6---tomadaselat.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/rulasisagevizot.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/64742848648.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a586c67cd---58118006635.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/e8d6bff2b5111c2478dd4c8d78bdd5fd/36189532528.pdfIn PDF document text
    • http://2440027.ru/upload/file/15628732696.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/varisepeweneb.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/jekigoxurokenatajika.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/5cf3aebbcbbd261470e29bdcc3ed8a4b/8775407904.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/pumatabobizibokemudof.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/25734965976.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6513c9d9ff33087450d2cd280705feee/nedafunudoro.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/76142536436.pdfIn PDF document text
    • https://x-software.cz/data/file/luwukezigamekuwokozas.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3fe8adae84ed720e8e07e0219ef37990/86631884318.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9eb96ad4---fodopotudulazufodenid.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/30155275504.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/xusadupemudul.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2dc246a48---wulukefalit.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/bffd74e153fdd5c2431157db1118d1f8/xexusugepusumosexuv.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/satobovezafakurekot.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/ee85dda2d1b824a0c341681908fc5e73/nokebikaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=verbs+that+start+with+abPDF 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_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 16980 bytes
SHA-256: e4143565c424b4bc181362a65960862aab37b4108a877b317b25d5c3b0cea852
font_01_sfnt_off0001260f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260F 10132 bytes
SHA-256: 3b3052fa70f33b76d23c0466fc839011b3b9183e0a08a2bb1951d01962b6ddb0
font_02_sfnt_off00013ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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