Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e1906b150cc406…

MALICIOUS

PDF

98.2 KB Created: 2021-07-04 17:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f3b43b796dd68be1c32638132b1a191 SHA-1: 34eb418247a0ffad14d758d9d3c57b60920f4ff7 SHA-256: c1e1906b150cc4067cac5db9a44f3dc55e961e0d49bb828662b1f495e06610f4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis to the link structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://skrabl.pl/www/rpbd/fck/file/16037332673.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-6-16/20210616003432683564.pdf
    • https://ketdoanbus.com/webroot/img/files/tipirebubasamisex.pdf
    • http://wabasnb.com/files/fckeditor/file/93592497360ae08862dca8.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087816328379---62356011424.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de2e2495ed9---tasenopisepimiguziduwevut.pdf
    • http://doyen.cc/images/upload/File/wusobupamov.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75e249acb---xamanozosonuvogala.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3f0fe1ed19ad7a8686fcec6ce77f08d7/jiponowupitudiwudevil.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fba4f4be7f---juwiwotuzejurexapixa.pdf
    • http://chnli.tw/CKEdit/upload/files/93850763046.pdf
    • http://creptiles.dk/userfiles/file/jufifolul.pdf
    • http://curry-box-deluxe.de/userfiles/file/kuferetudejifujexuw.pdf
    • http://randoquad72.fr/userfiles/file/55016221279.pdf
    • http://lnaixi.com/userfiles/file/20210618220639_1123290619.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aefa5673a---tofigazefikebexurojo.pdf
    • https://bevelec.com/bevelec/dossierMois/file/ganela.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/67fbc0ebe92569563b0cf633f52ccad9/lopito.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc935e72446---59691714856.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094308d0c3c9---gizudewomo.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2728294c80ad210cc7fc9810f59748d7/95124374671.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d477939bb8---dapubu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=where+to+buy+gysahl+greens+ffxiv
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109c0.bin
fe12909657f5274758b143fdd1033d18b9b294625e258680563b83ce943aa5a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x109C0 3440 bytes
font_01_sfnt_off00011779.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11779 16792 bytes
font_02_sfnt_off00012f8b.bin
e4b7a081056b8a63e0a0225fbac0ec2490dfa78c61f5dfe3ec0f5e3e6ca0c28a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8B 18512 bytes
font_03_sfnt_off00015fac.bin
d127be2d12750eeff6543e69c777d4aa439274b89496cd8338a49f68aefd2bb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FAC 11008 bytes