Malicious PDF — malware analysis report

Static analysis result for SHA-256 77eb7a8b9f944486…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 18:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd6e4a5adc13e2cfa85975cc0ada3759 SHA-1: d838573247e64c86e424ac60a3689d1aa1b017a1 SHA-256: 77eb7a8b9f944486047bd1181ffb5acdc3aeff4dc5f3fccc746390ec7b505f30
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier strongly indicates maliciousness, and the presence of JavaScript suggests potential for further malicious actions like downloading additional payloads. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3172c16628---51931754065.pdf In PDF document text
    • https://drlanda.hu/user/file/25534563032.pdfIn PDF document text
    • http://iccarrentals.com/files/file/78277763498.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/bb548cf5645350b2112f113e8646b9d2/razozarizefaxez.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/37658191233.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b5ddc03cc91764f2fe1ed4e9f81a24c5/fajujeturirutirep.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611268f6c003b---bakiduter.pdfIn PDF document text
    • https://edgecs.com/documents/pumerajamisituvakevuxito.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f40c62d994---sunaka.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/rdcecmvf30bk31j49nhe05gm06/37976425953.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/5gn3g517ov90cjlll83s3ogetd/piwojebusadelaxuxujuro.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210530/file/4280665313.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f36c827302f---97408635695.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/fizezipazobiwap.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/a64cm6f5fgil5sjcupu8452j05/fevowivufop.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/33661816307.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c3fc5e356---tiwatemibureluze.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/97015694099.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c26672f17---33624831716.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ae68bc582e5c85d25879dc67f4ab8843/kedegeg.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/18275064761.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/77720402383.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa4cbe094---55735448280.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/pukijidexuke.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/75634475627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=question+sentences+in+english+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_off0000da0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0B 10796 bytes
SHA-256: 1d38f8c3aebb8f2462edd7e45fc6b7d70af93a587fd40691b411d9fe7b9f4def
font_01_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 18988 bytes
SHA-256: 2bf5808c3e19652a19fe9510ed78ef80e27142b8e7d57235c7646c169fbf4d14
font_02_sfnt_off00012326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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