Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7e8db95a50f3a2…

MALICIOUS

PDF

86.4 KB Created: 2021-10-05 11:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5e31a9ec71266078b9f5b111e31fce4b SHA-1: c8b81961555df8db37af5e0dff13579c0fc5d6a0 SHA-256: 1e7e8db95a50f3a293619fae8d8804b67c9a1df30f425c35f50e86183f1f8476
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The primary attack pattern involves luring users to click on these links, likely for phishing or to download further malware.

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://geometramaurotozzi.it/userfiles/files/23667707903.pdf In PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/vasujawanepumusiwalexuz.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161496d6748b63---sasoponuxofekanu.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/87459751568.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/dulapekematuvag.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfdd3bce85---ladalisomonamivo.pdfIn PDF document text
    • http://schokobrunnen.com/idata/xudevelidamip.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/44164075184.pdfIn PDF document text
    • http://fluffy-chins.com/images/file/lirigusavum.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/xurarunexarumaxofabon.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/bibugamaxowidazopewobemo.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/36874643769.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/zibulapegorekobivapeva.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/97845733652.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/mabugobudozutavavite.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/bibeduwixevedibosilesaja.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/59832131683.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16147a78234c44---vebopax.pdfIn PDF document text
    • http://premo.at/userfiles/file/57403989204.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/53261454678.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/poboxumelutaxumi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4ffc7a9e---65487031940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=down+syndrome+neck+measurementPDF 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_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 19340 bytes
SHA-256: 222dd4bd8c0b1eadb8558cd63e1b34dfbc5276f40739ece9be5c77a7df039419
font_01_sfnt_off00011ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 10784 bytes
SHA-256: 2567c8a08465a9fdd034d559b4d49ec1f41233d9aab868ad3696f4fedd104616
font_02_sfnt_off000133c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1