Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f98f828244f692…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 18:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d908e9067ca91081ad293844240102f4 SHA-1: 90a0fd195657b7c26f4c253f739284d3763f6a88 SHA-256: d5f98f828244f692cf8096a4ed20020f5983ee9e3981cd462c6775d1efdd439b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting it's used to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15c699665---54917076410.pdf In PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074dc2449ab1---latugalenigobojulogi.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096477580727---19999720069.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/49022794157.pdfIn PDF document text
    • http://markone-tools.com/upload/files/nosagese.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/btefkcbh9jf7oil4s34s5ltro2/sewowoxatugerisibiwi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f319cca357f---91018291952.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/81555312964.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/43a2bb1886d98c234fe197e09a16a6d3/25268733256.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084f97626e83---zepojoxepubagam.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074521b4c82a---jusekokamujokalunolexo.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/57082271182.pdfIn PDF document text
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/pemoxikefejewe.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612dc7e999984---napipatizuwesegolumure.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210626094342.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/piwujetoxaz.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/dowusu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a3a0ab8aea8---jegijawedug.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077a70a4eaeb---56565760851.pdfIn PDF document text
    • https://inks.bg/userfiles/file/zililasewabuvu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160770081691e1---xitojubiladewotokoninox.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/kizigubew.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/wesodakararififamorap.pdfIn PDF document text
    • http://platcometals.com/images/file/gobivo.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/14959964849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hackers+white+book+pablo+gutierrez+salazar+pdf+descargarPDF 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_off0000d039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD039 17928 bytes
SHA-256: c351a70c7f0b6daef11b42ec874302b20425e609372b4d1e808560098bb8483c
font_01_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11694 11264 bytes
SHA-256: 70397eb82f10f9af2c7ae264e68413440fe9ebae9d2d613e0945598ca2d323bb

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