Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a77d67daca6e92…

MALICIOUS

PDF

76.2 KB Created: 2021-09-21 23:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 34a610972582980bcdc30334f71eddda SHA-1: a0d986286e291d0272e12d80e340a99256f0550f SHA-256: e9a77d67daca6e927e53e46133e0817307143b25a8ec5178c887a5cf9eb2411c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the presence of external URIs and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://irlanc.ru/uplcv?utm_term=break+password+pdf PDF link annotation
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161354cb290bae---26254094561.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/jaferizovuga.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/xekovosesinezixudovomapu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/diqbp4usve94ar09q7iodi2m15/84237714879.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/94eb8256a7a82369b367261640848f8e/zabazulexide.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/wajavugoxuzeti.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/79098463271.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/werususuzisaxexuwakibubow.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109121233449072.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/23416748035.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/sojonisunifozaxoxovelutos.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/jusojuxubinuwopu.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/78974949438.pdfIn PDF document text
    • https://rajaunited.com/contents/files/87292376082.pdfIn PDF document text
    • http://sbcnepal.com/images/file/21644286209.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/14330546895.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/zesefutijojuw.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210921174908_1289486536.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/12798462128.pdfIn PDF document text
    • https://actorconseil.com/files/file/9232335714.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/87548346808.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/furojegu.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/zafakavobanelusona.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/46492469627.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/37270691371.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109031937372856.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_off0000c3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF3 18372 bytes
SHA-256: 801d1e719daea95cb82dca0adc3a2fce297642d738de9be0be30f92341fb3d31
font_02_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 10380 bytes
SHA-256: f2642e8b808641e24d626c839770acb8b9620645ce4b997e77ea1c183983ed43

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