Malicious PDF — malware analysis report

Static analysis result for SHA-256 803636aa0ade5271…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 11:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b7a43b66053742bd9263700346e4c1a SHA-1: aea8b7b73fed401b37007098230383508aa2ae3a SHA-256: 803636aa0ade52712cfdcbf6e381b9df10819834170491fd44be4e5289eb6bc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://seabeachthailand.com/UserFiles/file/42645595979.pdf In PDF document text
    • http://papienbanana.com/user_file/file/kamoluba.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/32532057072.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cda9332f7---mefofofebokadute.pdfIn PDF document text
    • http://e-sheremet.com/img/46134941591.pdfIn PDF document text
    • http://lucann.com/Upload/file/79207133583.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f495a071b3e---69474607671.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078f7bb1e9d7---31476736158.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/2c4cc31d82aec65dabca7f420b2f9ecd/88520353772.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/26071853578.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/7668527922.pdfIn PDF document text
    • http://flexa.cz/docs/file/93167173560.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nqc98tbeegk61oqd3ptj74hbm2/5636253903.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/wafulebirudasanovado.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/valapumiriloj.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/141254351730.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/546197161.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/xagesodigito.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/posefavevovet.pdfIn PDF document text
    • http://saaretravel.ee/images/file/vetuzepogut.pdfIn PDF document text
    • https://sanidom.pl/img/file/jebavupufomaseteguzo.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727c9499530---bunuvawomowasimomir.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749c315fb40---niwolababekan.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210724_BECBEA1B427F3B0A.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=multiplying+fractions+with+whole+numbers+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD282 18812 bytes
SHA-256: dc5b4e58473c31a761f5578f6398069d62810a9349e7b7854691778625b7c07e
font_01_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 11500 bytes
SHA-256: 358ab75ad7894ea29dc87477be8df40519f3db8ba19572bd43d5d9705bb8c45f
font_02_sfnt_off00011e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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