Malicious PDF — malware analysis report

Static analysis result for SHA-256 949c26e8e6564218…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 12:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56dd21a902855ca5bee7ca09d32279a5 SHA-1: d7d65372aa170f753e18b0544d926255d93bb49f SHA-256: 949c26e8e65642188544353ed0087ceca39865938b08a0a9c5a9508d3c7171ab
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 a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or manipulate search engine results. The document body is unreadable, but the heuristics and URL analysis strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://krusomying.com/data/file/xofasuwivinivugiw.pdf In PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/44331088113.pdfIn PDF document text
    • http://tercovci.cz/files/file/35177254209.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/binivemifazolusixomina.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/taledarotuxanuvu.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///falel.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343cb0e04db---pomivaxixapuxakino.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/67838879088.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/adf93572f69e2a97bc05b687bf291c3d/fimidapadoribomasigazol.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/raxutuxifixerisumixekuge.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/powiwaliledasadireziwiku.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/pehietjto1f3uvmu7q4eqtqaqj/defivudo.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/zoropalemigekixud.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/50800204598.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139efdf0c621---malesiboxavo.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/32196041099.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/40326591035.pdfIn PDF document text
    • http://jinyezi.cn/upload/wonim.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/68439587501.pdfIn PDF document text
    • https://netlandschool.cl/files/lilixikimitipugifudoturaw.pdfIn PDF document text
    • http://i-dron.cz/data/file/12069740419.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/94579164618.pdfIn PDF document text
    • http://www.og2c.com/images/file/44042354093.pdfIn PDF document text
    • https://tdfstore.it/file/lanidifefimurokev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=use+of+app+clonerPDF 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_off0000c5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 16532 bytes
SHA-256: b22a33603e7f720256bccb0e88716833e2da219baf79044379fe17fd01f9f882
font_02_sfnt_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 10288 bytes
SHA-256: 9d72b4166db08ef5cf66a4e89d04095a22d754a7b70cc135b5b838ddfe43346a
font_03_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 23080 bytes
SHA-256: 456ff325e3462a7ceedd7393332711c547707bf373fabed20e5439e0ff1604b2

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