Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec681ecc29a3a67…

MALICIOUS

PDF

87.9 KB Created: 2021-09-13 14:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f71f9ac0c048f3130b6e0c68d156a6a SHA-1: 6953f91872182c46b663ca6e41974eb81f5055b0 SHA-256: aec681ecc29a3a675ffcaad035021ba95449019a123b176f0484d9304f247ee3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to numerous disposable or compromised domains, suggesting an attempt to obscure the ultimate destination or leverage compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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 https://appvid.eus/userfiles/files/46361975266.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138cd11f2ef3---82565965310.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/gefazegijelu.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/85767207553.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef7c1e147d---boduzasikol.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/36219576955.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/84389233645.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/44991048627.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/87945891528.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/adc04eca3de5eee3d6783ab832121c70/65620674711.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210907154553_7kdt1n.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/91476171298.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d4ad77b5f0e1433f304bb17321e576f4/munoja.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/kubar.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/3400899360.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/da3d74217adca090dc7b066976a673e8/fixubanojoraturixenivoxe.pdfIn PDF document text
    • http://chinahongji.com/d/files/padajadeto.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/josufilavabomuva.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210909092749_gg4pd2.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/niwuzilowezones.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52af84c6a0fec68c1bcbead8215c62f8/xusobexuziwa.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/11158712992.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/xoniju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dragon+city+gems+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD557 20776 bytes
SHA-256: 2af663441cb5aa996b620b293354c2462be348c7790f1927883721dfa9fe0b8f
font_01_sfnt_off00010a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7E 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_02_sfnt_off0001201a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201A 10876 bytes
SHA-256: 6f7d674edb8a68f24b08fb2804e1491cb5bef7bf4fd6d8cd688e76f439855d73
font_03_sfnt_off0001394c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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