Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa41a1588ea8135…

MALICIOUS

PDF

77.7 KB Created: 2021-09-06 08:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c27b3a445d3e559da349c4d8dfda00dc SHA-1: 92e414683f5c81aca4cadcab28bb88da787a6910 SHA-256: 9aa41a1588ea8135eddbf93ef9054cf8f9533726682ea2f75d139ea29d06af0a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://thaiboxes.com/piceditor/file/fapidakerevofu.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d30994dbaa---zijebonisulibatumutazej.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/suwudovevatuwi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1efba8f29---wubolapap.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/zaxuma.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/70044968083.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/h5qr57mjtdt882rpqa1q953p15/butenifofuvuf.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/tugulinozurukaborejuf.pdfIn PDF document text
    • http://netflor.pl/upload/File/wamidepubi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/5f0af18f568c3c3781b1bec9650ef86f/51725705808.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b0c8bf2cd8b346907b793fbae79bf5e6/75982150853.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/12694834969.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a8cf3069fbd---78968040345.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7b95e8f6f3a55911d42b142ed24621a3/sikidoxosebigodino.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914b9769676---jazis.pdfIn PDF document text
    • http://alcantara.cz/data/file/65880885587.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/xedupogepofuwe.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/povovisogubolavatofowuxot.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0de0f347c---62531588026.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/bujvm7n1snpf2kktl8ejcqbhe4/21267514993.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a11d0716dc4---xobuvatu.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/92144877250.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/81781797043.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2b417d3855fdcf55b8010a5bffa1560e/90462167515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=political+philosophy+cahn+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_off0000cd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 10600 bytes
SHA-256: fa133281a9d94ba287860cc2373cd8a0e6c7d24c480e55cb91579271276ee485
font_01_sfnt_off0000e5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 16752 bytes
SHA-256: 0cc0f5f0929077c7d2353ebc7d26048806569cb3b15ab927d2fb3ff37b2b6489
font_02_sfnt_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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