Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56e4605bdb28ce3…

MALICIOUS

PDF

85.6 KB Created: 2021-06-27 13:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 74b7005693b2536ccb2e2a4c7f2bd3b4 SHA-1: acb86709f7cf6ccb83a2d2d0ca477536e83ff966 SHA-256: c56e4605bdb28ce359cd95e404d7cc343717e1bbb4bee637093132f02b530700
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and compromised CMS upload links indicates an attempt to distribute or host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/124426723eea42c8893c421800a1f7fd/zilezelesulumituvosexovor.pdf In PDF document text
    • http://immobilieninvestors.eu/userfiles/file/10049167926.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/70387799921.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b63efc74ff6---19806934357.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/ed7486e339e7ceeeef15e10920bc1c9e/barigot.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/nijedolovuxaritofigajox.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/37859104451.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e8c308495---21699682438.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c6047a4dc---gotadabefewalujudevawegi.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/vewunamaxadalo.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/18329538111.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/favefa.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/medawawiropogumaganutatem.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5068cce22---fosutufuzibesove.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/2793775433.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/38731308438.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8d6d1cedcb988f45fe933b545920907c/mezog.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/2132932425.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607629bc1e3db---xaluwigitatuketosotav.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d979b554372ca93265c52cb58ce86db7/64062758237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=sink+in+englishPDF 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_off0000ea8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 18456 bytes
SHA-256: 884e79bfc9f8637294ab63a6b97088925f4f15aeae4d089546ac97841f2af1ad
font_01_sfnt_off00011a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A09 10072 bytes
SHA-256: 3b87ff42318a325c09775809705624f56f3713ec0df4f92ca8605604910237c0
font_02_sfnt_off0001304b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1