Malicious PDF — malware analysis report

Static analysis result for SHA-256 76590ff819fcb117…

MALICIOUS

PDF

85.7 KB Created: 2021-07-06 00:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2a54183b4f6e21fbc09222c30b035841 SHA-1: 5ac19b2fc696da36c926661c4dabadbb893d643c SHA-256: 76590ff819fcb117620f67a27a0b198671fa32e11670d01ba1b8a908308825f4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous unknown URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://portugaliaimagyarok.com/ckfinder/userfiles/files/9184375326.pdf In PDF document text
    • http://alliance-vietnam.com/upload/files/xonivi.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/fovebasorulelerenotilovex.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/metagigiditerur.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db47e16b969---62651824413.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/nowuj.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-21/20210621152439653453.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac86b34a1e---42704220945.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/32945026464.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/lolebopipuropolix.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f226522e4c44240e77350f084f590c4a/45103515692.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9424da84b---gugiserejipomasesasazij.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7997ee67a8---tejegajogasonitom.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/kofiripawavomub.pdfIn PDF document text
    • http://burke-gallonfamilyreunion.com/clients/28163/File/ladosame.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/270ddpqv3fn5m6erh055v9l4e2/degewop.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/sizotisa.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/59104685919.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/redabapumivipatodo.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/60413666999.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/qs4lrptponn08hp1ji6gdifqpn/55019023764.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef2f92952a---2089787879.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/jusosuv.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160747a7b521cb---kusadurovarogugin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=emergency+surgery+while+on+blood+thinnersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 16556 bytes
SHA-256: c2ef752d6d7c590fb9f8fd9717582eadf0b5c625ba2e3ea9c6ae1dad7fa7e38e
font_01_sfnt_off000117c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDD 11080 bytes
SHA-256: 07c1d9b72dbdbb9f944098efca81165f3fd91f55f23b4028e21773591d89b026

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