Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb18891107f1e6b1…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 23:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3404e27ddc2ca43d161fa3b899b1f279 SHA-1: d6cf59b5ddc73bb766f928343a5f0facf7daea93 SHA-256: cb18891107f1e6b12e0e56230ee5c6442ba79cb2cb1b2d865250f252322c4e10
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://canavesiobruno-architetti.it/userfiles/files/79680601590.pdf In PDF document text
    • http://tcgardening.com/userfiles/file/2021091209580473499.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/89473032116.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65d1dad9817d6d292b0c7decc9babea2/2419206222.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/fepesabo.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/81592a98b7b3fc881d70c8e89adfb170/joxadisakenu.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/70992006533.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/f9s5elk4d094thbgp7hj7il0ov/wudenuzitelukek.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/2165432237.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/35386604856.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/zowamavibesijiwiduk.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/48fdc7ce4184abdffe349056af4b6dbe/posotejonorijelovukulanom.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/85257587135.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/61978040421.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/45559636301.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/52026732736.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/21006923411.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/fec0884a4bc169f5fd419414a0157253/44935267413.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/bijilazesininugu.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1d20a5c173efc616e17b4caa5f862852/93942347430.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613463c9a57da---71576683116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=a+wife+and+mother+android+apkPDF 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_off0000b37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37D 10708 bytes
SHA-256: 44e16bc26a304a67a5bf47cc30285d54ea93ccdb667bd9730c099ac5c3279c51
font_01_sfnt_off0000cbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 16340 bytes
SHA-256: 59246a54f0f07489f907b20f8dde8eb1233acac98186e61827bacdc2da3e0cb7