Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04c3fddfc6125ea…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 01:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2b9647686fb53cf9f2a707be17a5d712 SHA-1: e1d4cc24ec5f32a369f63b9579e16618e029a253 SHA-256: f04c3fddfc6125eace7927168d3fb780c4a8e6ffca69ba6ef5fc9ed517c78d30
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript suggests an attempt to execute code, likely to facilitate the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ka6c9017538cm3ml6oskke6qv3/83612871740.pdf In PDF document text
    • https://kindeeyudee.com/ck_files/files/98571981335.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/gefejamuxo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffcda3460---26051284852.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/kikaremo.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/43111986617.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/50a315664c4245bf5132e4bf154130de/zinidulamokititizovaw.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/52741873658.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/97475663186.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/sifokixitib.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/mikulumusutizoletegex.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/sudigivimukada.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/67438787573.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/11589826936.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/23031548789.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/348998441.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/41840936393.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/95447480311.pdfIn PDF document text
    • http://didopack.com/files/nebolunemizu.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140c3e3a35a6---dofun.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/6g36mpubhd1btt15jrs7a5kr89/93789347033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=shapes+for+3rd+classPDF 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_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 10668 bytes
SHA-256: a1f616907582b9935b215b08d62da29b41700bf4cfb1904f9010592c97ab5396
font_01_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 17172 bytes
SHA-256: 9e1bd9687c9f1828d738a5900ea14ad94599667664007e6057cb0824cd00daff
font_02_sfnt_off000122e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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