Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0c37c33fe11fa9…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 14:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46f1621b11145b672f55cf2ae608b4b4 SHA-1: 1f8ca993bd6a0da1d780fe72e423adc2600b9897 SHA-256: ca0c37c33fe11fa9d0c24bb9a2c4a218ad0b0f69fea873bfde79c0ae73ff4108
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised WordPress upload storage. The presence of invoice/payment lure language further supports a phishing attempt. Although no scripts were extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content, likely a phishing payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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://akamercedes.com/images/uploads/files/4571498523.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c02264d34---gajuliravafevi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609442248a7d5---sevinuponoraxume.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/jesusedaxile.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/fodenovuvinuzavul.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e9360d87e---lufofaruxilotofot.pdfIn PDF document text
    • https://schmitz.cz/res/file/33861664560.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfcdccc2aa---taregogukagasujalimuzen.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6db1c58de---11747269295.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0b00ecc0f---subugawiwufudejewolod.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0efd5689f9---runatusolopafu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f2fae6565---dikadela.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/dujomalu.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/i6p2og1omne9a7lgmva7qtrjsm/25880323402.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ce254a1bf88353b7962bb205f432acd8/55570718768.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a849b62aa2c---54497235940.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210522045242_d3blgg.pdfIn PDF document text
    • https://citytrafik.nu/images/file/44262035930.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/90606972985.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c15efe40f6---vuniriwutixeretaviwefani.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/3815o39o1rt0gs8f7po76s55sb/1286343416.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16091e7181c630---janezekuruze.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/j80htag2gddr5vvvjafo8qo1v6/tuwezefadaderov.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///98285027136.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5e4b4dea1e131c4e37d8be906a6e1431/60865114277.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/l9ug67p3605u30lfcfi54chksr/metojere.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/fugasovexarataw.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/redafuzizijufevesefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=suing+for+services+not+renderedPDF 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_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 16992 bytes
SHA-256: 75e3603a2ca92bf0cafe6387c31bddea8ef42cd2e961290c3e43290810d6b2e0
font_02_sfnt_off0001352c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352C 10684 bytes
SHA-256: fe4bfad613c585dfd58c2e51b57040b5605b4b905ba14bd17d2ab57e82b99b2c

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