Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06820bbe8e8e778…

MALICIOUS

PDF

80.8 KB Created: 2021-06-28 22:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0d4131b9c228292d7f22b38621717a36 SHA-1: 6a4b51f9f6892d1cf0444651e8cefb3e3fd5239e SHA-256: c06820bbe8e8e7784ae5f1f9342ee87ce2bf3137def333f8bac23d5199d75e56
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4d0c48c85---29536212897.pdf In PDF document text
    • https://davaocarrental.com/images/file/78744156822.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/todiviribetizeni.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c443552726---rabuluge.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be43120deb5---19323128020.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160916cc563fbb---9403582875.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/28720350090.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a57a0ebc374141e1e9ec855d4cb156d2/mezedepafedifimewozu.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/13362395334.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c429d36eab5---gipudaguvabemibo.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/66753314783.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de5e6a3190---zugekinesa.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/jimekipikelokinowori.pdfIn PDF document text
    • http://bronia.org/userfiles/file/padosoraxibekiwekus.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/rudedap.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fb7fbf14e---82224673274.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084417b4784a---losupideja.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/86750107561.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/86456571236.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/605957754a096af10fa935e32eb98f39/2177323916.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160866194dea40---pidabofisumolavegajugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tyon+grant+fosterPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 16772 bytes
SHA-256: 948abb69087331c6befc8015067603ee7334857260f61b36b0bac034b8f4413b
font_02_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 10328 bytes
SHA-256: 3ca718e663342401cdc9a1de45f86d005f62e2d332c6d695d35f83739e14210a
font_03_sfnt_off000120b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B0 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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