Malicious PDF — malware analysis report

Static analysis result for SHA-256 9947ce1fa99f8153…

MALICIOUS

PDF

111.4 KB Created: 2021-08-10 09:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca02c9bfe6abe1e5c26cc62f80220224 SHA-1: 5a014929291eab46b129b35f4c058aa4e2187dbc SHA-256: 9947ce1fa99f81537409cd329e8d18184618a1a35d6d360d0aac0d724d5e5c5d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The presence of invoice-related language suggests a lure to trick users into clicking the links. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/59340bc4b67ad0e44a5d1c4144b5d4b8/73073650772.pdf In PDF document text
    • https://ayurvedaemart.com/uploads/file/xagipenisitujobuzebuvisis.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90706d64d1---34421641923.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608122f7eca44---majunafesuxoxumuwaj.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/muninepebex.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/xebatasikep.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/nalefebanomiperelekipop.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950e8c8e1ba---susibatebibosutananawubuw.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/miigk1rdcqcd0i5d3mft25qqnp/7827572588.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4e387e7e3---21837049719.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/vifemawifegumusorujot.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9736f768f1---fedixuvof.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/be2302c5892da72d31847b1bbbc54fb2/bexajewapo.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rj92r0e6g221nphnud3tef2tf6/nujesalikezepulugonubaf.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210802_CBB6DA921538FEA8.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/pewegukexajepikapis.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/nf0egv7kb67m66t0kl5ri4sf66/sojaromubeduruwirim.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/14930041260.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/72528956834.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4d7c7dc0fcc0e5484e83b7b5e6d2a315/xizevubapubovenewip.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f480e00025---77798288783.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/39805192723.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6b045774c94bb4217b1853f9f3b3d1f5/76812059776.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b3914f00f---juxakovovevobisibilari.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/sugonefoxuledijisu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e3488c28---pobemeporox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=criminological+theory+past+to+present+6th+edition+ebookPDF 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_off00014ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA3 11508 bytes
SHA-256: 24f99efd0d23c9a4fdf66d251115d4f4a167bc35ceb51d28b4835ee24a8fda75
font_01_sfnt_off0001664b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1664B 19016 bytes
SHA-256: ee82abb35341afd4936e820b0b3202e6fe7efbf79b69c10c1614e461b464923d
font_02_sfnt_off00019736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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