Malicious PDF — malware analysis report

Static analysis result for SHA-256 238cdd36740dc05f…

MALICIOUS

PDF

91.7 KB Created: 2021-06-28 14:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1636b9529d181d4023b6f2c8cd9ecd0 SHA-1: 4995cea392e5989c990d1b3fbf0c0d2011dd38de SHA-256: 238cdd36740dc05f607b5e27be05a8731ea73be3ede202938887ce945a2922a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple suspicious URLs suggests a redirection mechanism to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb275db7f---19789282949.pdf
    • https://mollis.rs//files/88292940719.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/781b3bdb578458f02e027ef6ec0e659d/lumibadisorupirewinoje.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ad022f17---wewuj.pdf
    • https://mimpishio2bet.com/contents//files/supuke.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f94c17202b01704757de7d8fac4c5143/sugisepimevasiwufu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54f6903bc6---77674725509.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e79115db89f02eb4e7de267c0d0b9ac5/xaxikul.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850d7229157---10201227718.pdf
    • https://astdubai.co/userfiles/files/walemaxifatefu.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9d2b337c4---mavuxokerodavisofolovaj.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b210dcbbb3e---40355861905.pdf
    • http://hubbardfamilycircle.com/clients/62940/File/xixugodexalata.pdf
    • https://fotokeramika.bg/userfiles/file/41869669621.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ad14ab4c6---badibulelujasumiwobexoxem.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952faa13876---watog.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/00d71978bfa9cb0f1e6b0bf5b050dd85/68546219276.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/bbit24ph4rcf7j15u37ab1kell/40826891234.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/dk5o60r0jjpeis0f165e3eb86u/132388679.pdf
    • http://vandientuchinhhang.com/upload/files/33888775207.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b0e2c9bf---gotunenasikabagal.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17e9170cda---bifubegukawilatatap.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd868a7688---gazumiluxisifugesiw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=stink+bugs+in+your+house
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010436.bin
24034d21948fc927dfd98238043fe7a63e217a4dd8a93de4d4ce58491242e832
pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 10700 bytes
font_01_sfnt_off00011cb6.bin
08b466481d5d92c6e5f5cabf68decca78914d1caef00180e02664749b4bb4529
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB6 17184 bytes
font_02_sfnt_off000149bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149BF 16792 bytes