Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc3c732359f1c4f…

MALICIOUS

PDF

85.5 KB Created: 2021-07-15 21:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7c1786e1072d362f076d31790041deda SHA-1: cee433e8e105be6e7044b1a3468fd6378f02a630 SHA-256: 1dc3c732359f1c4fd869b7bf9b5ceb0f9c932596e6e6be0b5091d5174668847f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document contains numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://ketchas.ru/uplcv?utm_term=the+meaning+of+fay PDF link annotation
    • http://ashioke.com/images/library/File/papununixifi.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/jitobudufunotenifobed.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/xenudikizezekaxele.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3af1bb408---24002892833.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/xirogawomufukepokesukarif.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/j77dq8v62ij1r8bv0rbe01jcs9/wusizagazifojuvotod.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e575723c3c2---40366845253.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/8e99bbd9d188f493439e50c2bfe8d607/18678857579.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/norasugekeburametezifu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609819d56698f---desemawogogojef.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/1fceaecee0ae4a67ba857d7454c5b4dd/63270544536.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/5958fd41f1ff31890b848f22812c0c01/sakotisixof.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/47403397559.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/tazukebeno.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/fimuwuzeti.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea0f9633d---xemerazuzojovovabazaloge.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8pb6q49h9of42ltu25vll85972/girozazavasuju.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/33721903516.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/897c9cccd41b9a4813aa33fd61714175/simazawa.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607f007bf12bf---zobinu.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/50243466912.pdfIn PDF document text
    • http://krzeptowski.pl/file/zenap.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/575c4811e567efc6d25e2e8576675b91/99681303193.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/3320988995.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c23bf5c6fe8---82992060085.pdfIn PDF document text
    • 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_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 19728 bytes
SHA-256: eb4da99bba5f3bf37063de27acd9ae09ec241c20f761b1fb7cc3281f0cec240b
font_01_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AE 10324 bytes
SHA-256: c1a0e6663a0c60792b316b0e471863cb1477fbdd8cd120486219ff90b9860530

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