Malicious PDF — malware analysis report

Static analysis result for SHA-256 03afb2bc2fa40a45…

MALICIOUS

PDF

95.2 KB Created: 2021-07-03 10:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5e8e3bc4c7371c28517e8dfdab3eb18c SHA-1: 4d0dc2c3c72aa609f40c8ba46fb5528888ddca40 SHA-256: 03afb2bc2fa40a456e7a1dec595aef56c70b758872eafe88b6cc12f2f3cf09cf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The embedded URLs, particularly those pointing to formcraft plugin uploads, are suspicious and likely serve as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d55b43b2---8032496254.pdf In PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160afb95901ec4---nexiragozawejet.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08cec2190---sanupewisotududoz.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f28a330fa3c9dde7228efe37149282c/41559457728.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/44760451620.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/74482926473.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/3pu76ta4l3bk36l0e4dpvjr725/59777453358.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf41f9b0b6e---9299716657.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210623034711400599.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/d16e75b281535b64990b9fc85d0fc799/lamimisikedim.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/40431449762.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6a069e66---61283463871.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210626052129.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ac5d050badcc5853063ac076d074a987/kavawijijojuruxewobixe.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/l2lqfh6rcbbi7scrqjvsuatjos/1911200985.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/gofikafotaledaf.pdfIn PDF document text
    • http://cissi.it/userfiles/files/totiwef.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210615_144704.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/f12f6b7a38c1cf444280873ddd8ed508/vonurisasel.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/e24d79d771e673927cd1a3679bfae869/32620927756.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/42967da1a5b5346db0ab936c0636f2c1/38282776151.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/pefikevugodizuzinurex.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/kuvedomore.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/8438067677.pdfIn PDF document text
    • http://santeh.md/img/files/38342233158.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b333ce68e9a---45021728707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+can+you+dream+about+someonePDF 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_off000110c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 17220 bytes
SHA-256: e0bed2e1a836eedf06dd970e7fa3554eb13f4fb417e56e9e1c5cd36e6842adfe
font_01_sfnt_off00013e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E02 10824 bytes
SHA-256: a157202018f3700de008bea8810227827267de36693fdfa835759c25c03a7b2c
font_02_sfnt_off0001570e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1570E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1