Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d454d9554b96fe…

MALICIOUS

PDF

98.5 KB Created: 2021-09-07 02:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2ac54cab2966c60b0f5a438c71cdfceb SHA-1: c225e4ee36e4b7a5e84131334984f17b9deedef3 SHA-256: 81d454d9554b96fe4a41223393914d05073731f4f9cfe9e72cf928548ec19d8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://ansonseatery.com/uploads/files/9567433357.pdf In PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c32fd67d3---fexuwosorijisif.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/32195644145.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/telerovabamipikalotutore.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/26174609058.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3a2a3ee7e5edb97a7e1208f9785848f0/rugezofepofoduxuvoxezuped.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/wowoge.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3akc0ka2q29p7pu50pj8sfhurh/xirigumoterurigegafa.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160984d1fabb14---pepupol.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/67679860050.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f99235ff9fbf6f31c205f8d9063697ef/79225291363.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a747c0edf8a439963138688fbb43aae8/17575079524.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b4ec55a7c44792ebf4664eae2816d0f3/76316836287.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/pifewonewekarilegis.pdfIn PDF document text
    • http://chlahb.com/uploadfile/2011/new2011617/files/2021/08/20210821041206.pdfIn PDF document text
    • https://alohasafaris.com/files/82632852683.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/81665046612.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/28487827340.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/b63d9e838312168011ad02421ebfa36c/35659305451.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/givuzogoretiwabedapeze.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/d8nvu4m1umj2csjksc1ehlfvr4/fuxapitifanepiwemerege.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/xexudexabitolusewe.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/85987685817.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/52382128712.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/99537805324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=isomerism+notes+for+neet+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

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_off00011b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13369 18876 bytes
SHA-256: cf333e2d4b4faa14e0545383397753ec29ed2d63e54533af3b3a5ef6a864ea5f
font_02_sfnt_off00016523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16523 10404 bytes
SHA-256: d43e7c93164c73086d6873e412b8ed179db8fa5da58c09e86d984541ef5beb00

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