Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e8f8b91c77a70a…

MALICIOUS

PDF

83.1 KB Created: 2021-07-14 06:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ab00a27e58e06d1e96ec1676becc144f SHA-1: b4ce8af7e02108df7b096418c1d869b61c2a0d9b SHA-256: b6e8f8b91c77a70a47b4d8be6ee0504db5c163563e0fb10b640b2fd365d3f9cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites utilizing the formcraft plugin for file uploads. This suggests the document is part of a phishing campaign designed to redirect users to malicious content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://synerhu.ru/uplcv?utm_term=spend+less+save+more+slogan PDF link annotation
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160adb61c0d2a5---59203575165.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1e48ce9a---poxeremetufoposo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c63c968e6bd---50844741229.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/92998545806.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/13766873060d61667ef9b0.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a289d71a667---96297067753.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be413ea60f3---goraxazowoxijaranizinifi.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/2f3addc6b091cfb7226753ab53d33e01/4705212835.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/n6o602eq8fkbfpcsegt9j9b7ef/67460632867.pdfIn PDF document text
    • http://megalaserasia.com/upload///wuxidewevoguxanafuf.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/ad38b7a05b9cf05f241c00861f8b2aca/soxinimetefelozosojolozu.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/32205351322.pdfIn PDF document text
    • http://2440027.ru/upload/file/mebewetaxuzimuwot.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/88f908942ab326e6655a684a1635adbc/ledenupafemixonomunej.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/98464401685.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/sewavamutolonilaxaf.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5527a8bae---romorewo.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607587eba0890---gixavimufafemodub.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/bifovopoxiwusa.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_off0000e38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 16760 bytes
SHA-256: d963b69d0059a3d2bb9aed2ad42d7105701e83d0dd0411dac4786221c0426343
font_02_sfnt_off00012741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12741 10684 bytes
SHA-256: f9083c9381934797d791080406f7a675a5bf52d71be86d4a0a056869e36a24c6

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