Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2acc616b43e554f…

MALICIOUS

PDF

88.0 KB Created: 2021-09-06 03:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5ae82f18ac8243999e41c362a63c88af SHA-1: 3ed799065c8347d416fefaec4a438241a3d755a0 SHA-256: f2acc616b43e554f5af5528444f4ace81ca984fe1ea10dca902a7996a4961b2f
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The presence of numerous links to potentially untrusted domains suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chetaomaynganhnhua.com/uploads/files/35927980806.pdf In PDF document text
    • http://vinhhangvien.com/upload/files/mibora.pdfIn PDF document text
    • https://yodobashi-church.com/vosakatimidojulibegizofe.pdfIn PDF document text
    • https://istanajp2.com/contents/files/72043652767.pdfIn PDF document text
    • http://www.celso.org/download/bevuwozinugowanifisibeseg.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/53849392862.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/56676759260.pdfIn PDF document text
    • http://tipiland.net/upload/file/sekapogutisogajibenalal.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/92235261772.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/vagewidawuzagododujogomaz.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46309866805.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/kuxomogatavozamo.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/417c7bebb297dfe649623aff93229665/sajawi.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/82474249508.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d1eb31ae6b326899c626dd326b0b1e39/jepidegowu.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/10835285261.pdfIn PDF document text
    • http://www.bandungmesin.com/file/73140379157.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083f0eca4f85---kamofolitixezunixade.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/tthgs7gjhbhnm7ndetn45f1k9e/59398856984.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/bejuvadejifoxez.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adc25293944---nukadisanamamaguxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=air+fryer+cadence+manualPDF 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_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 18940 bytes
SHA-256: b186ffe431a70289785727e89d6130e939cfbe2df2127e5f49f3114fe149433c
font_01_sfnt_off000122e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF9 10444 bytes
SHA-256: 491eded6ccb68cf30934056f860cf05f5f751aee8ba32dcac92769a9065dc5f0