Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a834b4f5081f96…

MALICIOUS

PDF

87.4 KB Created: 2021-09-13 05:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2f27608621d6179880beb5bff49b89c5 SHA-1: 0b7eec65005d341f3d693a2053a6b8b1f7fd0159 SHA-256: 07a834b4f5081f96e4834835b791c5371b87ca618dd6589b7d265d6b5644399f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, with many URLs hosted on compromised WordPress sites. The presence of external URIs and link farm indicators suggests the primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f92e4bcb22---97269109127.pdf In PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/9248495657.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/xibajupokerevoguduj.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/vulezedirutoxupituxono.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109071101179170.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/mosusezomosivamerisid.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/fumimovutov.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/51691060880.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/xenudalukekawevuwilew.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/57569064204.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/51242063535.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad55eab354---77971920128.pdfIn PDF document text
    • https://yifff.se/userfiles/file/15450747684.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/8m8kiujk6thsg4nbg3otu0kaet/2034823413.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/70364408240.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/73478429088.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-13/20210913054956888075.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323a77cc731---62141256645.pdfIn PDF document text
    • http://qwerty.pl/_data/file/72910032733.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/fededase.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/vivojizidemoxetajosid.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/15552841116.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b79c10273---sanulemojipuj.pdfIn PDF document text
    • https://sapporopools.com/contents/files/40734169607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=portal+by+pushbulletPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 18360 bytes
SHA-256: 7518efe2e985fbea0629f6ef25b97d012de9fd72814949b09df5e88c282aab23
font_01_sfnt_off0001088f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A6 10508 bytes
SHA-256: 70f773ff953843aa04e6f49bcc748eb3644d9650aa4aa9adac56aa4aedf612ad
font_03_sfnt_off0001388f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388F 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878

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