Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c996d07f3c3c0d…

MALICIOUS

PDF

97.0 KB Created: 2021-07-25 16:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7fab77c527f5bd8cf4cfe862657227ca SHA-1: 8dc6507cd1cf9e3324766d102a409f0242912d82 SHA-256: 75c996d07f3c3c0d79536093e5fc06440536cdcaef3113a17c6da14a77a9a0e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external links, many of which point to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute further malware. The embedded JavaScript likely facilitates the download and execution of malicious payloads from these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://parzenica-bialka.pl/userfiles/files/vumetejajevokisemusinunex.pdf In PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160987cadbfea8---50797242239.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609019f74d0c8---81222225141.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083358ec7c9b---80464288422.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8e42636fa---29309120210.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/3636771696.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/71655447271.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ba0415fc23c2c56f9e49a244e4508f8/nevovapizalorol.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2417924ec8---makopumefisamupolumivav.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-25/20210625193433934786.pdfIn PDF document text
    • http://cycling-software.com/files/file/juxisare.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/27190430696.pdfIn PDF document text
    • http://gyobel.itpublic/file/39749267631.pdfIn PDF document text
    • https://people11people.com/uploads/File/25508620569.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e1478234---rurakimugepuxojuzifa.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160797ad31920a---48962773263.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/34498945439.pdfIn PDF document text
    • http://parisplaza.net/clients/3/35/3561a7ce45da2f2f114a98ea6175a4b1/File/rixupibuvafeteke.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/cd02d833b1415b5a4fd47d23f66f6590/pipimetuzusidelogij.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/gasirofekiripavulemale.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f403d416ed---3153792100.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/85717224092.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/e48bcb39891a4dc61093d44da93b26ae/baworu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b17d6d94---jevujubivudukire.pdfIn PDF document text
    • http://picfs.com/189smcIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=solucionario+dise%C3%B1o+de+maquinaria+norton+4+edici%C3%B3n+pdf+descargar+gratisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 11704 bytes
SHA-256: 9234c34ac02c0c31875c8a3c8e568f2fe99761a28c629e1753f137065f1a0992
font_01_sfnt_off0001111e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001292f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292F 17044 bytes
SHA-256: f686b22163ab596af323b6f20f0191eaa8bb0efea77c49fc5fa583b42a02dfae
font_03_sfnt_off0001421f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421F 18660 bytes
SHA-256: d969ec7c0fdc8a79ab5e30bce5ee7d7775600f8b52bbefca55333ae17ec709e2

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