Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60faca2e918d82f…

MALICIOUS

PDF

87.6 KB Created: 2021-09-07 13:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a68f0bdc38c72eab3973f6286b2dac6 SHA-1: 0f0fe75528cbc719585a48e0fe255be6912435cc SHA-256: b60faca2e918d82f8c0d1e88341fdc4f31c8ddf435a1715f0dcf7bf325d94517
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many hosted on potentially compromised or disposable domains, indicating a link farm or phishing lure. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.anieliasfx.com/uploads/textareas/file/wuvamif.pdf In PDF document text
    • http://watthaistuttgart.de/userfiles/file/91945191621.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/78412418077.pdfIn PDF document text
    • https://svltv.in/userfiles/files/jukomosarowexika.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/d48a1c832a77024f4a737d6e49b6f703/jakitajelejuw.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c34575fb0a---vakinotuxiratiru.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/65669520624.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/rupaxevaxakalul.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/dfa63f874e8139879187e9ca9b115e95/mizoguzuxasepoli.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/88834d2b1c0160b64d7908b60120a974/zofaripenasa.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/72567667871.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/39736217593.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/415d866158321ae4c053ff8bdbd63daa/govemanuxekutenozegoziz.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/46223997952.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/mazeverezow.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/vjpfai8gr505jkr1p32i9oof4j/77487537570.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092b31f25970---segiwubilukesadejab.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2575490bc002916dd189a9041de22192/zukinus.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zonafuzitekexubabew.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/94480708455.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/duvosatafufopenixosuji.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/0fc760d69204aedf9614db782595ded1/dusodoja.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/89937812159.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/634beaba8d72115d96e730aa12ebcbd9/2591395528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=rotational+motion+class+12+notes+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_off0000ee39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE39 10900 bytes
SHA-256: 81eedba7d6e16c4a29f23524e6aedfc5c9dc6db8cef24cf9b388ae1a8122ef66
font_01_sfnt_off0001077e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077E 18552 bytes
SHA-256: 4eb2ca0d89380ac56ef3973b677efcd855f362aed4126791c929693ab2a62b85
font_02_sfnt_off00013832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1