Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad74ebca14d77e4…

MALICIOUS

PDF

82.7 KB Created: 2021-07-19 07:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1df41669e399aea133933d43adeeab4 SHA-1: bf05b7844d2c28ec4f7d5628e32d7527d4bb3cdc SHA-256: 5ad74ebca14d77e40b567cdfa7d8ac3407efa2be5c471831fe4b8065ebff9317
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external resources. Several of these URLs are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to lure users to malicious content or phishing pages. The PDF structure itself does not contain readable content, but the heuristic firings strongly indicate a malicious intent through its extensive use of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://mszukam.pl/dat//file/57846314045.pdf In PDF document text
    • http://uralinteh.com/uploads/files/bubilukeniruguzov.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/85342099795.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/nevigifofeve.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b85ef33acbf---siparunetu.pdfIn PDF document text
    • https://asiajitutop.com/contents//files/1384522782.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/vifubomobinuwuwe.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/99318678541.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/9alb63rkpj0535ofvh1k8dg1j8/borumaresufev.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/wanutavejonobedewa.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/689576ddaba8afd622edb755d6869428/kebov.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/xukuragivekewarokadimubix.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/401f5beaec6ab0fab00f32b01073ade7/500996842.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/30944907607.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/605f9fc570715a11ca491043f31921b7/49609144781.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/weresisenuwovurijubavi.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/pikun.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/99006800802.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/sujubilituvudakuvedew.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/dudupedujip.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/29degdcqc0h0a0nqdqta24sl5h/23453600208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=form+49b+in+word+format+downloadPDF 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_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 16784 bytes
SHA-256: d0575da28078bf935db78175b2d383fd002e2a65b0b09645c4e2e47b6a10a621
font_02_sfnt_off00012522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12522 10664 bytes
SHA-256: d4c30b2de9775396c4facb9288977f03a285868d714d7d4deb647b62a3e59c6e

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