Malicious PDF — malware analysis report

Static analysis result for SHA-256 306dc4a24eebf9d3…

MALICIOUS

PDF

77.0 KB Created: 2021-09-16 16:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b54bf7b2cd12fe1de98cd7ceebd8ddf SHA-1: e12d78089502005b24e02b0f3c37386277d5948b SHA-256: 306dc4a24eebf9d35db0503ed864f6547a73775b82c7e1e8160aedb5b895d343
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics further supports the attack pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://gaia-onlus.org/userfiles/file/polifekusa.pdf In PDF document text
    • http://studiofranzoni.eu/userfiles/files/33474903419.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b11ca2d30---4888194065.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/velexurokawatexif.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/fujanuzenog.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/18728151131.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/8oth1dsb5s5k5vfuv6ks4ucbg6/juwipudomekirorebewexovo.pdfIn PDF document text
    • http://mamam.by/upload/File/file/vepexekilamarekorudeximel.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/92372941848.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/15215371811.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/55429585675.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/66405844652.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/reropovagemimusu.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/98965580985.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/55597660624.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613026153c08f---1213324017.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/gedikawerubisoramila.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/14338271844.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/xurozamanolekotuwukab.pdfIn PDF document text
    • http://lg-palette.com/upload/files/voxalawanu.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/lcg6elpce1ul6eq9jo4bqtmr3d/jevesol.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/midugajokezivule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bubble+witch+2+apkPDF 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_off0000c7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C2 17864 bytes
SHA-256: cb0693f24216c860adde0fe215ba0f3e742fe6920ae2e0597edfb390b71e4eb0
font_01_sfnt_off0000f663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 10572 bytes
SHA-256: e0e9f197ecba4369de9b1d91b2a913ad60751bfec75f5136fefa85f3f63aac87
font_02_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1