Malicious PDF — malware analysis report

Static analysis result for SHA-256 652cb255d0cd7caa…

MALICIOUS

PDF

106.7 KB Created: 2021-07-23 20:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 71673b8e5076779bb8c709c476f05aa8 SHA-1: 770b3df24a6998b5bdb2b3f4bbb9271efb033466 SHA-256: 652cb255d0cd7caa6629370c2085d8feedba32d35311a21033e727c547bcff6d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d387a47fcb---zerevet.pdf In PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/v9850ftvln176kc2lecd82hn64/143298891.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/2621954898.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cq89d55nkje95mh2mbgi9o6vb4/66403710570.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/892736976fd893a95098266a6d6bcebc/tevulovukesuduli.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/685548caf204da68c5cca38b807c03e9/wenenovilosiwivugodof.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/16825673566.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/379ncuhr8k5mssq25aoojgkm3i/fobexabu.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ad1493d25797a7c44f207dc7e56e7f79/99517212028.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/64428185476.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/83256939525.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/88665908632.pdfIn PDF document text
    • http://teresachild.com/upload/files/59849528997.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/femofi.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b103b3ef8f7---jivubadunirezinumisotet.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/moejgqpen4vqatb9pi8e2o37b2/vasunokawowibir.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16086f87ec8f84---fixawopavubuvorozadonezi.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/zekuwaba.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/55354545082.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/moe8kviamrgvcoj46j263kjrts/tododogadolozevit.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/26b6aed90be90397eb723099ce3d8d04/22422079743.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e0d0115e1---88813028374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=circuitos+de+accion+motriz+en+educacion+fisica+preescolarPDF 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_off00013878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13878 10972 bytes
SHA-256: a596ab15df4a3b4a397b44438c6865f5305a34f14059b9a971c9c34251ae7069
font_01_sfnt_off000151f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A0B 19796 bytes
SHA-256: f8efa6284230d0dc970b134bb6b447ca27337acb4474e0bfc74d1aa96c3a2f21

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