Malicious PDF — malware analysis report

Static analysis result for SHA-256 9180dec7d3e7ae55…

MALICIOUS

PDF

82.1 KB Created: 2021-08-18 02:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cb17cc827a980ee3d90e777fd6c92160 SHA-1: c303aae59eec335e8bdd0ad30a62d1f50e8f886e SHA-256: 9180dec7d3e7ae55cccb288474d337872960e2c975fb2f28c9ccc9751e379b93
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to phishing pages or download further malware. The PDF structure itself does not contain readable content, suggesting its primary purpose is to host these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=guias+nintendo+new+super+mario+bros+u+deluxe PDF link annotation
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd052bcf38b---juxujatekewaguzefoxamal.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/korarateninimavaduj.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/2625572066.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c9c4cfd592aefca7ec61a770f33638e6/27013101349.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fed80066316---67326558777.pdfIn PDF document text
    • https://mollis.rs//files/12095958646.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c290f8627c---lubovep.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ecdd511136092eb21f0def4a6e07f8ad/godogifedasuwoj.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/83991073464.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca62066c36---sowoluvasakufuvig.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/76271728564.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/fanitamilixowigaxada.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd54471ee6---dabuzore.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073e4d5d82b5---67938684227.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/mijel.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/wisikijenokixefarik.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/36027689892.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076215bf200f---likaregodepagoxuw.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc2ece2d0---11207000182.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074dbe786abc---40472428448.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/xaxifemukutujopibuvikuza.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/6393105641.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/rizaluvenepedu.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/fezifudozaridiruv.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5fafb6445eb21a279fb594f514cd88de/93157780966.pdfIn PDF document text
    • 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_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 19652 bytes
SHA-256: fbe88b0d67e6ce224f47de6cf1f2e4976db2a9f6f89d8538275d8fe5836d3052
font_01_sfnt_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 11020 bytes
SHA-256: 934e431215c53da7c6d3fd44ba6bcece5e9708310449f69b70623235623ce9be
font_02_sfnt_off00011fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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