Malicious PDF — malware analysis report

Static analysis result for SHA-256 801b3e85ee685b14…

MALICIOUS

PDF

73.8 KB Created: 2021-09-05 20:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c44c727573c8bcda86bde553eaf5b0a SHA-1: c37f86672188615603a4795500d24448f8fee4b7 SHA-256: 801b3e85ee685b1420f3d609586b1e91334f9b64343a7488825dad65561c10ae
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URIs, several of which point to IP addresses or compromised WordPress sites, indicating a likely attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, potentially leveraging embedded JavaScript for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • 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://homeopathyhongkong.cn/files/dafojedekive.pdf In PDF document text
    • http://mientaytourist.com/uploads/files/14918455883.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/74555606599.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9830b8bb57---gapulik.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/61224316126.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/74449031547.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbe05f9b9---gufolarugibirexo.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4d72fbe11d48ed1b48abd279b5e09946/37500561828.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/6137502238.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3e73e12bc279269949108c26fc90209a/lapuwo.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/813aef26e8d35026252c2cd130176e9f/64139074681.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/punuxadowejukolig.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/a8a0vl8eb4cqoeljanokkopmhf/2173449350.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/52404816077.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/80364876996.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/toxezidowevapu.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/gosafamatazeke.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/28687267909.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/c0cc1833fd07166147680ebce6959c27/1655706157.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/a5615cd970579de9138754980109e19a/jugada.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb51df08d9e---zuginopaxebipijivof.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16125111de3ba2---39675744920.pdfPDF link annotation
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/jivesasaza.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6b6f83aedfd3732069e3805746e3b62d/gelogiwurazogirababu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=candida+treatment+plan+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_off0000c077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC077 16528 bytes
SHA-256: eff6e1837f5cc0fe1d57cf31f136925a7884e76c268a0d2211057baeb9e61549
font_01_sfnt_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 10404 bytes
SHA-256: 9f6928597692737c56f5a4115b9a83af5f59939de5855e29cc3fdc27f64bc6fc
font_02_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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