Malicious PDF — malware analysis report

Static analysis result for SHA-256 7614a7991c2f6419…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 07:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 985b02e56389b1268cacd442e505ac45 SHA-1: 166d93a5f953ee8b53bee521adbc4c2e4a157840 SHA-256: 7614a7991c2f64195794c5a67cd35f510b87e3b7d0c0eed12482cbb9361c4f2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mecaniquekd.ca/upload/file/74865075956.pdf In PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161408f3c77efc---26708881890.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/i00eqepl5li1agbitlmnlndjoa/newiworej.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/42200375668.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/22611197532.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/foluk.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/2573904380.pdfIn PDF document text
    • https://greenways.at/userfiles/file/malutaxafu.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/jojosopalimiwe.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/sejigowamefofivow.pdfIn PDF document text
    • http://hingliltd.com/userfiles/lekorob.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/c30ec665a54447f7ed6a8d4157a46c55/suvive.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/kaxagofikipavugexifipofe.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/silukafoxijez.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139da9e24d14---kuwug.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/91418442266.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210909171520.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/zerutusalavinovorolumugad.pdfIn PDF document text
    • https://angkalaris.com/contents/files/50165757912.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/63376138203.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/semuf.pdfIn PDF document text
    • http://ibb-online.ru/f/file/48759951414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dictionary+words+beginning+with+yPDF 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_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 17928 bytes
SHA-256: b5c6a20ecfab3a5edb7c185bde3ae0267e77df6b9fce1922d5853c890f06c6b8
font_01_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 10944 bytes
SHA-256: d640a53e6fb73f7f8d6bf0a6c081b240d3a085edb8a666b19ed17b5cd23eb5e6
font_02_sfnt_off000122bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1