Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a55e2cd8f79654…

MALICIOUS

PDF

76.2 KB Created: 2021-08-08 18:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3a547934d171ee8fd3ff46a0dc2cbf2 SHA-1: 3a8817eaaabec37a187bbc6f6037dd9894aef7a0 SHA-256: c2a55e2cd8f796547dcdb4590e37a89983befa3ad34b4c521f75fa028cee50bd
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term' in one URL indicates a potential phishing lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://allytemp.ru/uplcv?utm_term=speakout+advanced+workbook+answer+key+pdf PDF link annotation
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ea40128bf---67488422285.pdfIn PDF document text
    • https://koreayokogawa.com/ckfinder/userfiles/files/gerawadesavarakusorazas.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/82750072398.pdfIn PDF document text
    • https://ienter.bg/files/molitodupejuwa.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa69074254---34417242497.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0a87ed193---34222883037.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/josobulut.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/78305471722.pdfIn PDF document text
    • http://agama-rc.com/upload/files/wivateguwina.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/kepufukawapekoj.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/1172887415.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/gamov.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e00951dfb1b---pazuzenufitivetu.pdfIn PDF document text
    • https://fultoys.com/userfiles/fefafudugenibege.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/8daeaa562b98d90a15226d2a3c420d34/80508516505.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/97323500428.pdfIn PDF document text
    • http://cecev.com/stockages/files/69657833006.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/pojegadikixiripab.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/5bf05e9c31c9eeae2825dee0c1e6cf2b/fogawizenovisavisake.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/pumejakivu.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc8413570---1985772653.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c934ad8bdb8---32926753937.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/61923295135.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_off0000c45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 16848 bytes
SHA-256: d20d48a4a146302cf545cadee98a723daaf5dbe6322f7b3a2f985d944ee65aab
font_02_sfnt_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 11148 bytes
SHA-256: 635aee773d5560f5ec7e6131094e4c98cff1bca3ee32f557434d12ddb1bf9cea