Malicious PDF — malware analysis report

Static analysis result for SHA-256 882da3853f6ae526…

MALICIOUS

PDF

95.0 KB Created: 2021-09-04 10:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4c6ac67c047f31f54e0c78842eda34d SHA-1: 6572d21cf4ac314335dd05a60aaa0c9923668293 SHA-256: 882da3853f6ae52609b7beffe3d176a2d6c417a0920ddee4652fa86dda1a8a56
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous URLs hosted on compromised CMS platforms, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2aafa9e34e---bijizobopadilepipebifu.pdf In PDF document text
    • https://garnet-medical.com/userfiles/files/kedab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b766d423ca5---63860319938.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/9656888334.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2c8cbd2fd---womamate.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/sumazufo.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c14b2b837---23837641919.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af75c28e72e---gorebowasurobuwada.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/557f06726eaf70beb92492fdd217072d/72185586310.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961b09a5a6a---voxujizonasetewatemozewo.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/jirisisafipatubeniditaza.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f3c4fa54---suforema.pdfIn PDF document text
    • http://imaginove.eu/data/Files/43506193162.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f6390e90c---14252708204.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210723140630.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/52011555947.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b926403351fadd48e9d0a322ba1a0025/7723005045.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/45489465354.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/55258325422.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/kebodekebazikig.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/97012263111.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/83433847273.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/3da50958d9d3e733b2b8f11972b98989/timegunujofokiwot.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/62633527680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+book+of+angel+raziel+pdfPDF 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_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 10768 bytes
SHA-256: dc41656668bbd69c05697a17d5135188e37d0585e86939f78368acca2d48d404
font_01_sfnt_off0001219e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B0 20536 bytes
SHA-256: 9730b4a38ac1dae25e6df0b6daf012140ee55a0b37345b2f88853376cb841b77

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