Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1031782be78f4cf…

MALICIOUS

PDF

133.9 KB Created: 2021-08-21 09:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae004f96e7efd30e1dee26d4bf092750 SHA-1: 67d8ed356d3382312484341d7acda61de99b770c SHA-256: e1031782be78f4cf2f040dc28d8530fcbdca45045515f36582239f63ad7b9523
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious websites or download further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adc793bd02---kopatalupemokimif.pdf In PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/bemejipojerixaxukor.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/bh627j42hkqtcnn3dsvhknjse9/mezusepijuzezudutoxofaxub.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/fixudawimuxol.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/92597904813.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/42713187782.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3acb8804---48877532211.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb4eada58---tidef.pdfIn PDF document text
    • https://beaszemin.com/files/48575645832.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822f4ca08eb---risumadoroxin.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/38a2ccb253bf202bc8b4b738e58a3794/16852063044.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c60d7225dfb---15909526251.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/e87059a750cc19df858e72ec7cf3f010/97683153032.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/da9be82cc356e7721cafcb2503425f1a/desalasezajos.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/hmk82361rhns9slup2ike9on97/xisepofevab.pdfIn PDF document text
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/71060338815.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/74979236937.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/41560071608.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd515276d5---21855021506.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609045c39c7e0---kutij.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7a29534fe---sejibetetadivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+are+the+4+principles+of+the+theory+of+natural+selectionPDF 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_off0001a824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A824 17968 bytes
SHA-256: f7a2e7ccd970b4b2e931e7cff01d94e9e163797e9fd5ef2c80a67e4aa8da0cbd
font_01_sfnt_off0001d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D744 10860 bytes
SHA-256: 45d9f30fd3cdb534e943bf2ca1af44959e39b846b0486c1a0a0a0be737cb7ef5
font_02_sfnt_off0001f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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