Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f74422a4a484f0…

MALICIOUS

PDF

85.2 KB Created: 2021-09-03 17:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a11c0f6b06c7f6116332a39c4098892 SHA-1: e8aff004eb1662ae3239c93f8ef9ea5b6ebf2ef1 SHA-256: a4f74422a4a484f024d96827c28ae5af56b692d0bb84cb559134d0910107b46b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5370d8cde5---durosazugazigudumogaba.pdf In PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/bafde9af96953bad492f84ae53a34621/vexaxanujowikodifavatoli.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/litiwoxazelovatirosewa.pdfIn PDF document text
    • https://777mto.org/contents/files/kakikosevomamefurijusiw.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/nagopununukudumazukarilug.pdfIn PDF document text
    • https://eklyps.net/images/file/13099106771.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/wugetinom.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797d8144d3---7827121196.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/2295e65e88fe0055284c64d6fbf3b12d/motebidovopixomebiron.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1cbc66627624def756c39d412f168fbc/28245828540.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/gilibameranokinifagabi.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/0b9451098bf1519c3a8bccf6684d642b/5596403634.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/kowuxuwifikexunam.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/fofuxenupubaj.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/9e7pmck6el5rm9kj36al82u1kn/68026558201.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a858d72371d---nadaleduvinuguxiza.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7gsqflnh28hbmb42hvm6s1kiq5/88384977426.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611390b32f223---mojobamepapunog.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/fomexavoratejo.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/51118188634.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af3d882d186---59735783305.pdfIn PDF document text
    • http://ruresept.ru/files/file/83294878688.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1d6350b200b5e391cd14e5c29c9c8046/bimododuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=diplomacia+definicion+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_off0000e3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C5 10416 bytes
SHA-256: f072938154ad39c3601cf7c61b7699027400d9c3a6560adaa1d2afea0fd0b8a0
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 20476 bytes
SHA-256: c235fe5a23f94f6cab557ebfeff588e593ddb81225ba6e967d9d92207bee2336
font_02_sfnt_off00012f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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