Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a554424804c430…

MALICIOUS

PDF

86.9 KB Created: 2021-09-07 00:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8aa5ed39950c43fa910b0d98785b3fa6 SHA-1: 9b22ed5d2f679f9e8817c1a4a8e124b7b09c5c52 SHA-256: 82a554424804c430278e80da62d4b0501b5fe808e50dc3a3e74b3796e31a7497
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wodepcb.cn/uploadfiles/files/miwagoxutozo.pdf In PDF document text
    • http://wtmongolia.com/materials/file/93884696417.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e2e5e073---64526652525.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7970d2502c---mugebovomipaguralukijozo.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/pexeduvulixamibezuxutes.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/dazusof.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210811_8EFC4FA1FA4FDE02.pdfIn PDF document text
    • http://iphysiology.ru/upload/18678344152.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/37477808880.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8vajjjdqg8cqebhjk5h0477qeb/simijavivires.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b009171d282---38880490676.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c065133d849---28436988146.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/63091a6ecff92ac3c5d78ae8fdf07c23/99388290136.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/qn0mld8c92n06ts946n4bii39a/67444589310.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/vepevawepiz.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3f6f32c451679eb66ba07e3c6029577c/92930882974.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/kujuzilabuzezi.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/71286589990.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/0964d8620e4ebb1a54eb6bfd9a7d400c/merelazatofewomupenal.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/ramujivedafesero.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/50692043924.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/75340469191.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/vololoraginewiwojibaxep.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/genulibatarofugijur.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/filulemolitixiz.pdfIn PDF document text
    • http://sport-way.ru/img/file/zekasumugiwiwisedegog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=nfl+fantasy+rankings+2019+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_off0000ec02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 18400 bytes
SHA-256: 939151bd334708d7efa8853b9c6128b854876a3f8e4967779b8ffdcb845c88db
font_02_sfnt_off000133e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E9 11068 bytes
SHA-256: b3aec91d791e529de43b7d3b301cd6e01bb2501f8bc546d337c06efbd028e1c2

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