Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44c7d5b9320d028…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 00:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca35b0d780d52d77d4ceac9a8c63ff7a SHA-1: 86bfc826dfe1b8be4d8f1de767abb86339ac0d4b SHA-256: f44c7d5b9320d0283e76b42545c932d1ca11a8113a091a1f8b44430666b0a408
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=molecular+epidemiology+techniques+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857c882e1f5---85269254576.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/5941881311.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ffbe8fc04---dibowonazes.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/xalixupimo.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/11003541923.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/funebazanasijikunukexagef.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/sobojuwukavijanoluvifu.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/71118369164.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/sipegopabipolivuwunuted.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/89655344691.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/73509194344.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/86075060883.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafb83ae7e5---zefimubunufuwiliputis.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/64412211213.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ea73bd55b---31596519408.pdfPDF link annotation
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/c79267571239a45f1ace9e7670917194/juziziz.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612992714087c---83716042457.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/11875548640.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/71152703658.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5396b03ca7---72621162805.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/kifusivi.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/79804346919.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/85800778160.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f6a9f6051e94fdb86eba4cd49e83c713/jebopatupikewamaxasewebu.pdfIn PDF document text
    • 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_off0000c19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19E 17956 bytes
SHA-256: 13c96555d64d9a249f4ef3ea8ef3445134623e2cd546c9e2ec4f85c6a725dc0b
font_01_sfnt_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E6 11420 bytes
SHA-256: 1b11f29d8c78df80c2c0f4d15cb04f82e888a6411b7ce1e7fa7f648920bff11b

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