Malicious PDF — malware analysis report

Static analysis result for SHA-256 8160d75cd2bab1bc…

MALICIOUS

PDF

73.5 KB Created: 2021-07-02 09:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c4e463c9b3f0405bf38c094984ea060 SHA-1: 02de84c33ec70890bd51f1f6be416f44f3003d5a SHA-256: 8160d75cd2bab1bc87c9cac34f048574fb59db473cd103a911846cc72dc0e599
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous PDF files hosted on compromised WordPress sites. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007. The primary attack pattern observed is the use of a malicious document as an attachment in a likely spearphishing campaign to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160911df29fa52---futideri.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9430d482c33df091738337b1ec5d22f8/gujezuxapijesewumawo.pdf
    • https://aspaeng.com/files/image/files/vufidib.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160890e3b3db94---juworutofibipo.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38e77bacacc57ccd6c252b49930160db/sudokazusegowezanir.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608969e4599e1---54931479117.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9abb2cbb4b---752246799.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/fjntem13e1smfk9h9vru2ril6i/jekodawutakana.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/97cfab22210fda5627a664f6b15fd47a/59045562352.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/723df0149c61f19564de83c0d98cc7b8/28890944082.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c66b57cbf---duzigotopuworupidinok.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a0ba02d2a---namiwopuvitisuridesun.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/151d3057447821a7de49d18951e60026/67495089888.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/l5bvfvinvvim5reqvrppp1lflg/fafiguxezotoxuxeduxewew.pdf
    • https://elnativocoffee.com/silver/upload/files/fabeduzusomuxikodetawi.pdf
    • http://praguetransfer.com/files/file/99365299152.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16080e189975f1---kuwugukovizafodukogipefa.pdf
    • http://arch-teh.com/pic/userfile/vamelogufixu.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609681781c858---31697732486.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4461b379e---lufowovu.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/8901735717.pdf
    • http://wallsfamily1912.com/clients/876683/File/85158739626.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb0899435---28866933129.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/da9f2a97976930d519f61b99c8a958c6/fufupitotamapene.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ossified+stylohyoid+ligament
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf8f.bin
aec983c5f971a982f19f62805012aea2efe4875c84e6571be7578fb79d972f4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8F 10840 bytes
font_01_sfnt_off0000d83b.bin
a5533dbfa1e82ffa235c2fef66b3877235d4b2a770beca1fb2a0f97193ab281e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 15884 bytes
font_02_sfnt_off000100fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 16792 bytes

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