Malicious PDF — malware analysis report

Static analysis result for SHA-256 421d7e8f0f68df19…

MALICIOUS

PDF

86.9 KB Created: 2021-08-06 04:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 481b6591020048f928ca3e96c2d89d11 SHA-1: d7a663a1008b08cfc16c428a524d1f2fe025f995 SHA-256: 421d7e8f0f68df19c9de528170a6e0f280d0bdade9d68aa1970cf0684c8e407f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ea305c56c436ad6214572e6972fb7981/20716159609.pdf In PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/kbubfu3stm19ftip0s8j6jmjcs/xiboxa.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/77226684359.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0b8ed23feb77092acc897bdb6db06dec/44338290954.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c1aebf5993a---dowikopagomogasude.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/pabodelikagir.pdfIn PDF document text
    • http://kids-ex.com/mupopelosomivut.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/30420709168.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/64064241208.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/vetetoziwenabutelivu.pdfIn PDF document text
    • https://tecnicamistasnc.it/file/29509096776.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/8f0ljgcag38ithl0p17ih3ecpl/vuxivajoxurovefin.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/semaked.pdfIn PDF document text
    • http://naucseto.cz/storage/28021330255.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/kasixetam.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffcb0241b34---12602347041.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5956ab2812c29bbff5c8930437551ac8/supadujex.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c87dd52a9ae---kogibum.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210710181039_tuj821.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/3b85f6d5bb2d5f868ebb397520f59b5d/39468746889.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fd99881ae0f---70924550223.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/85578414143.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/vedalibuwi.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/88154866145.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bf2af2a37df---defaga.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fd9827a67---23918750309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=silent+weapons+for+quiet+wars+document+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_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 11188 bytes
SHA-256: 7756ac97549e519718f45d199f426cc4302edc059e0c58c66058c249598996ff
font_01_sfnt_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 17308 bytes
SHA-256: 7c070e390045947f52c0ca2466c407902f203f20befd93a0dad3d1ee1fc351e3
font_02_sfnt_off000133cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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