Malicious PDF — malware analysis report

Static analysis result for SHA-256 a939739b190ccf08…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 19:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 11a9364ff86e18b314263ca9557a7a19 SHA-1: d89f3408db09911159c5e60dd99b5eae1c400cc9 SHA-256: a939739b190ccf08c1cd4ba61349344e8cb185d8cc77e5cb5afe615f7b3a3003
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The primary attack pattern involves luring users through a malicious attachment to a network of redirect URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://sdes.in/uploads/wifosepumukavojubabod.pdf In PDF document text
    • https://rimi.sk/userfiles/file/16889931202.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c81c46e48---57115277496.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/73518118842.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/gutiminazudexaxubu.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/10180972912.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/89665041098.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/jerulalaxuputagawimu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135c19f9a47f---waworavatejuboki.pdfIn PDF document text
    • https://www.znackakvality.info/files/sowotapivaxefilopaxosavog.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/josojipukazipinopev.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/zudajasetusakorufaxi.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/73415412733.pdfIn PDF document text
    • https://kokomanis.com/contents/files/74746869995.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/vobojetutapovufetemakes.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/vusuno.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96584493082.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16153387c32067---dababuvin.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614b96cdcb842---26740108315.pdfIn PDF document text
    • http://floresdeserrezuela.com/aym_image/files/xokokifutujagojuviw.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/68383813419.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/zemiloxujab.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/34892694558.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210920_4E20DB7925E345D8.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615335fde14a3---55335446336.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/21419677732.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/n49rcmsd37ebdmjcb772dhkr82/rafetifuferipazenaveti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=live+cricket+tv+streaming+apk+downloadPDF 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_off0000b3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EC 14320 bytes
SHA-256: 1a60b3b9e85e99e6f2345403c16c63edcc7a60d160b6e1f17124ccedc957b466
font_01_sfnt_off0000d7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B2 11060 bytes
SHA-256: b70cfc52d880a84364e0f43ed47809519233fcacc25355203fa178cb7104c527
font_02_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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