Malicious PDF — malware analysis report

Static analysis result for SHA-256 6702d5e9dc80aa71…

MALICIOUS

PDF

87.9 KB Created: 2021-07-01 12:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: da5936e135b550064b1cbec9ccc6a826 SHA-1: 822ed0e9f4d893a81ed05cc364fe19d7c8f54932 SHA-256: 6702d5e9dc80aa711208b21971041f163d338a10b371177c7025d4f6f9248315
104 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to other PDF files hosted on compromised websites. The ML classifier strongly indicated maliciousness, and the presence of link farm heuristics suggests an attempt to manipulate search engine rankings or distribute malicious content. The document body is unreadable, but the overall structure and URL findings point to a link distribution or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=pixel+art+color+by+number+free PDF link annotation
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/000fbf1fcada468b09cec67225f063e5/59755689666.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/geboletametapegu.pdfIn PDF document text
    • https://kopari.hu/files/file/13727295942.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0b7b164bc---fovofolesaloje.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1928540f98e59754b884740e6514fb8c/88283588042.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/nifowebamupoma.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d001b6908f7---febedirebifasovedanepusu.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/gcpbhed0cdllgm9c4ocunl7o15/pebaw.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bd07595ab---69777642634.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/v65h3temd8qg3u0msqj7m6ufil/kijok.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/2079521259.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e10eb9a95---69592398593.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/5iohulgnvnp35215ncf1h2k450/74620174758.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/68779229300.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160770194dcaa3---xakemufemev.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/fujofujoguwelim.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///nosumewezuve.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/xipeloruzawaxosub.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210623_2CF73F97B94A89FB.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/79699428005.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/ramekunolo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607577ab6611f---25066318213.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 10788 bytes
SHA-256: 78cc666a903722a4b18333958bd88fed632716ac1e48a67c5e7bb8f46b5d8d6f
font_01_sfnt_off00010af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF9 17448 bytes
SHA-256: 0f426662ccf995dfa8e24d7cc2e942744a7b59efc5f47a97ddde94edfff7f449
font_02_sfnt_off000138cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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