Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e393b1adc25f5f9…

MALICIOUS

PDF

67.8 KB Created: 2021-09-17 07:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7320a43327dbfdffdcee559cbeef4f70 SHA-1: 9d6c0007944d7009e49fdf0b4fd4244c5fb0cc93 SHA-256: 8e393b1adc25f5f98b7d59ccb295d696dc07ffa97e3775bed62c0f992667ac4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://queure.ru/uplcv?utm_term=crack+wifi+password+apk PDF link annotation
    • https://locktactyuma.com/ckfinder/userfiles/files/zuvukinoxujowuligamuzibub.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/junuwobesegibewalovo.pdfIn PDF document text
    • http://darec.sk/files/files/fifajubefoj.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/75339548610.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/4140995731.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/fifur.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/32180225108.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/lojon.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/vudozazogafurixa.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e8c2b7d0---22995235725.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/70172855511.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7ae854c67a0731717ad314486d79ad9b/zasodubewepibafew.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c6af61fe7---65731819469.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/keluvinasoporoleduwav.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/kuladowakines.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/56161267434.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131055c87c77---ruxitunigof.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/94460832714.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/tadex.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d69cec01---nusodudojozimisibijo.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/lokuxipapafelavixuwakakug.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/12532142438.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/17543096089.pdfIn PDF document text
    • https://nasikampung.info/contents/files/fuzutawexatedirusude.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/71893995609.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://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_off0000b2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE6 10444 bytes
SHA-256: 748a17f211a0f588deacbc356ffb10fbb51a0d546cb8fda7154c4f4dac2d77dc
font_02_sfnt_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 14704 bytes
SHA-256: 223a7f970fec908b9d2b7606ff97bdcc321c370c59b25fbe4a9da1e8a1c92363