Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bced845259038cc…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 07:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14a9f92817440aefb6cb846e668ae3e3 SHA-1: 4bfec768a4118cd728d9cdb8107e3a1719120b6a SHA-256: 7bced845259038ccd182d077aea6044b14a7d29d11497764c130b3efc27402af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users through a series of links, likely to a phishing page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sieuthimaycafe.vn/uploads/file/komejes.pdf In PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7737d782e54c5bdaec8f9416e497feb0/98485506696.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/bexig.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c556d55ab---94367052881.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/wovopixavu.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/nofididobekirudawid.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/91201523390.pdfIn PDF document text
    • http://hrudolf.com/userfiles/zanesinolafabejabufusi.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/9fbe1bc8cd1cfb9bf73bb7d23ee2eaef/tekawamosize.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b29dc0bac06---sabovetasulejulamureke.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/sojufevikivu.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b96b42d79---60675525348.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec0e596a72---73087073939.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/piporer.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/40415056356.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/92461023472.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161150aad31a28---54704074417.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/455be5c17bc1caa84e8a58ad9c2b74e8/sojabisonujovaliwipi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c568945e756---33714648565.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160887ecedcac0---birawifusomekewuz.pdfIn PDF document text
    • http://penney1970.com/clients/7/74/747debde904cce1d9d58e62e9103e361/File/gojozadukani.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/pabaninikejomux.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1611b8cbb5741a---80288656860.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/70597734821.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610d7a17966ed---kagikurunanibozotiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=extra+and+co+curricular+activitiesPDF 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_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 10612 bytes
SHA-256: 0e77b62f3f0c6bb9adce91d04fea07deacf1d3f9cb7c6bd95cc0397472e623eb
font_02_sfnt_off00011025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 17096 bytes
SHA-256: 28e973dac06fb728a913763d1ce8eb34a8ecbb6736c69bb59841c0121b743abd

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