Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1332d46be5ec8e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 20:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8405a1980b70afc480774e0db52b0bf6 SHA-1: 24b61ae569c8940dc55085ad075b610da04c839b SHA-256: 7d1332d46be5ec8e47c4852a3f68910c80120d3c628c27cec10fd145889f0a18
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially improve SEO for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://copingconversations.com/userfiles/file/4327188099.pdf In PDF document text
    • http://kamnitikamini.si/upload/files/burejovosifutireviju.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/7c8bd51afe5a1f01bcae9d0a8b8760ac/21030377761.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba618040c45---18506148465.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/78401567529.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/68738272461.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/gobaximinuw.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///bujupuxonumefopola.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f73b46c15d---givixazaxagigetalude.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48c50ea22a---sajibum.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610a289b3ef07---84042815791.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d2a19695536a6e87c1e7eb0a8452b70c/3184883689.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/fokamevejorerevubosixub.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/jotirorosemis.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/wesunokujitaruderixidufup.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/netafalerogitutigok.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9e88fffb6620b55fcab02f98990c37ac/38832805491.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab479d9e677---xuxonituxuwopikerunipu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/6953li3sr70jfejdl1ctu0k0ue/gipiwavefutemebipu.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/lonevoxarigixunufam.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210716_B936207BB29F820B.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1367e822e7196b31bb848668971f8dd7/37072458075.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3f71bed897b34813a969e89c594c2b02/xeverewewabomiwu.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/60908271788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sistema+respiratorio+mamiferos+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_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 10584 bytes
SHA-256: 908fc80c1847d23315cdafee2db941b36c505686ea3d2439535d271a9f939b33
font_02_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 19296 bytes
SHA-256: cf338d56f162cfda295525efa9e697c59215378a9a8525f73609ca4a78991f82

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