Malicious PDF — malware analysis report

Static analysis result for SHA-256 c957e4fe21c375da…

MALICIOUS

PDF

84.8 KB Created: 2021-06-28 04:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dc79e8eae4d757de03a4af273e34566e SHA-1: 1bf7d5528ef0d790aede41060447b5cab3b0836a SHA-256: c957e4fe21c375dab90d77abb96efdad9d216b964b9ec05c4c2e5779b51b384a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate maliciousness. It contains a link farm with numerous URLs, some pointing to compromised CMS upload storage, suggesting an attempt to distribute malicious content or engage in SEO manipulation. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://aklond.com/UploadFilesfile///2021051204575389.pdf In PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/gunifusobotaravibejev.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/87263380510.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106152143052041.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160707f447eb84---38547604660.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/mgm8rj6g36rgmn1lgd1rsd3jh6/xuvunabopesud.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/e4cafec2547e0320b2eb08525427db70/65840906572.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1368c5a4f---92802347720.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210529_169E2D36C88FFD76.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/74e95f0535ac4150b95c1399472c3585/wuxemuxabereb.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2fff661a7---94152273778.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/f0c271ac6ff4a1ed2c475b5931a5e581/somuzoz.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097822ee64bd---73680450085.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/61b71f225598b5c5f5c56786018a4adb/9475527225.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/79254034943.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/lusavagamexuxibukef.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/84410717099.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b99ec78ad5a---jopamisesirerowukajoruk.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/jobabila.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/9tje91u0uub7cqvubktbih22cl/37960384968.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210606_75EE814AA0FF04BD.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/togedumutupuweju.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/33353589269.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/1408751643.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ulj61utsdean0v171bn146blg7/jirinokumutojekefexuw.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/girunenutoxoxisigafogadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=interdependence+of+plants+and+animals+worksheetsPDF 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_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 16848 bytes
SHA-256: b51dbab9b7c23648bc5b72c16188b38c89842b85e5354fcf78ae044a0df69ce8
font_01_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF0 11016 bytes
SHA-256: 56306e9622510d5985649b9e6de3cdc79f7eaa2f75b00da823b4513a11665e7a

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