Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56d64a17ea8c65e…

MALICIOUS

PDF

91.9 KB Created: 2021-09-08 10:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86bc42f93a15195b532f16fabb211444 SHA-1: c0b8540f92ee3e08e5fc8fc423261560fc861fe6 SHA-256: b56d64a17ea8c65e48ffbf8d73113172aa6eb769908e75b8f94bb52bbb950d3a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and a link farm heuristic points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://sahyadrisevasanstha.in/userfiles/file/kerokizironubamadugovob.pdf In PDF document text
    • https://makanbanyak.net/contents//files/dopiduwuzokopopemiwe.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b456c24143e---zubize.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/puxinozusiwabad.pdfIn PDF document text
    • http://usateatop.com/_upload/files/36223938170.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/d9ov5hqn9j1pskn0i1ub5m4ub5/81808922593.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03917d01c9---rebirawitu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/09b2504fd9cc59e311ab71618fbc6b2c/2883528948.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6c6aa2dbe---78453224414.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/3189984013.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/867957475.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/918f44a5af0ac00d6a69014b4d5e82c7/toguribemegenikag.pdfIn PDF document text
    • https://begili.com/uploads/image/files/9387900702.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/gakegeb.pdfIn PDF document text
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/71636421983.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/20299152536.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/88669900283.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/34493095694.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/11905816708.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/28882882210.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/95938223302.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/57202540934.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/wutujukigut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+business+letter+templates+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_off000101aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 10756 bytes
SHA-256: 1dd8866fc2f0f9fa46ab65cde3bfa08578c70106f97a2e1cfcb8e4cd31642e46
font_02_sfnt_off0001322e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322E 18488 bytes
SHA-256: 2eeb6f53baf6b151b01750a0506a599c59b76b48a72ca316bebb1b681cb795e9

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