Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4a330f71be8d07…

MALICIOUS

PDF

87.6 KB Created: 2021-07-14 00:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a76d64231ff3dc16a3967f6559eba25 SHA-1: 23c0cdd4c8f9027122ffe99e87aef43ef0bdc6cc SHA-256: 5b4a330f71be8d07cc89971e8f72bafca2044aed76556017360378d769065faf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs and is identified as a link farm, likely designed to redirect users to compromised websites or phishing pages. The presence of embedded URLs and the nature of the heuristics suggest it is part of a phishing campaign, potentially using spearphishing attachments as the initial vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oniceh.ru/uplcv?utm_term=what+do+black+foxes+eat PDF link annotation
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f4e2e30aa---95004620078.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/46affd4a70705295c1f3f69453a79ea8/wiras.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce4b92f61---71568187464.pdfIn PDF document text
    • https://tonitomov.com/picture/file/40899546759.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/36426965125.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4154355424---pekifomedu.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/47849209719.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/q0q4vnve8q9eo240r4cudckia6/77170899312.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kumawixakisakirokamex.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/befupowu.pdfIn PDF document text
    • http://candientuvibra.com/images/file/pavasewekowadufazobe.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6a3ad5be---58762352190.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608256c3d6af2---fepidapatemawomutuzogupov.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608e96c4c35bd---49458262839.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/54770144524.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6a1ae8da43a4a5cc343a425e05920af1/notowe.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a321243b58a---4568610203.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/46942402010.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/37647920993.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/aa8464c5faf87d54adfe3d04406d3ed4/mevib.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606d197d3657d---56892139538.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59f47ee2a5---bopifajojixep.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/9c456609e39ebcf321ef5fc4aa1187bf/36446627155.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_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 16940 bytes
SHA-256: 087dbf126918d347a0b844fa32b61e98a17f59b821de6763cd4ff1cc978f7f86
font_01_sfnt_off000120b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D0 10604 bytes
SHA-256: e2928e4331e0c6491a70888e44d7a7ce62efdf96b4831d96b85f592fb88245b1

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