Malicious PDF — malware analysis report

Static analysis result for SHA-256 87568b5e2e7c7271…

MALICIOUS

PDF

93.6 KB Created: 2021-07-01 17:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6188a44dc395c3c86a94a7ca549cab0e SHA-1: e1f3c5b16624ce0a926954d31286ca87b229e6ac SHA-256: 87568b5e2e7c7271d8b4bda8ae3623d5840436a6de2c9d4a9c2fac3203889709
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, which in turn host other PDF files. This structure suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to delivering further malicious content or phishing lures.

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://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1982c060fe998ace67da70ac36b26c66/jazoj.pdf In PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608985fb1c4e0---dulinuwolami.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e480ed2fd---wokesebavetafidilufi.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/87645f88b2b2dfad43e6b7682b20cf4e/1152684309.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/i6kt7ld8dgcjo458q46tbc6ad6/metotopukujazo.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816b9363fc4---daditizikuz.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/budivesunubukigagoxaliv.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/11927826268.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e03991914---61497484623.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6963d419a24fe40ad814e83e465f17f8/bubeserafujeluzosaw.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/16e90d4381a9cb248657174961b7a02d/jumuzojagosolawabedir.pdfIn PDF document text
    • http://foodchemsino.com/d/files/ledinasapivove.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c6c4580f1fbe98b0cb146cb5587ccdc1/xekepiriwikowakaxasut.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p83co2561lp3fsfm3ilns28ic2/16447782612.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/8851290120.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/75o5pgb7qmkdrf7djmr32vqil2/lalugarovurine.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/debc7f4aa3aa2ea81ed2c695a41b8759/zetupemiv.pdfIn PDF document text
    • http://firegallery.ru/img/upload/838906454.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095bba1388b4---zogabusizagobasubuni.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/05736f84b826ae92eb093047c00a259c/wajulenu.pdfIn PDF document text
    • http://amandamaitland.com/images/file/fuxesoluvetikivirusuzij.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/607e5659803677987c91a5255d206291/77932559076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=50+shades+of+gray+parents+guidePDF 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_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 17544 bytes
SHA-256: 7645abaafb235da5c9c6c67a86527565590f7347618406b85203afbb85e9f574
font_01_sfnt_off00013782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13782 11104 bytes
SHA-256: a4cd210523b159ea1715285eec53895953d5814dd034a59ebec8b925c7386909
font_02_sfnt_off00015134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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