Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50fa7f4ca9ff12a…

MALICIOUS

PDF

85.1 KB Created: 2021-09-03 11:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fbaef634a25c617d7727b15a5461df55 SHA-1: 7224faf41a111ff4a8def87a75cc551323717299 SHA-256: c50fa7f4ca9ff12aa3bafb49d56d769db4d36fcec9916c20cec8ad56371ecac4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://oniceh.ru/uplcv?utm_term=development+economics+theories+pdf PDF link annotation
    • http://lnaixi.com/userfiles/file/20210714150649_1754575118.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd848a60694---zobidanopiroga.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/vexexidufixofojazewepuz.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/wigedipobevixavolikapozes.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/rv41m644822qgd7o4cr3q089d4/10993969155.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/20fd8d0ff7d3768f1382dd22f7a2f2e9/97687767091.pdfIn PDF document text
    • http://topp.pl/_topp/file/46559478262.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3105d9a83---kajogoruloga.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/wizopegobisu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nt6n1tisremomuo386v6rq2307/sevupufavufexixilevuw.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/25325885868.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33160359620.pdfIn PDF document text
    • https://path.mn/userfiles/files/sirokorezurox.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/27873814047.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/bitemig.pdfPDF link annotation
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/rosffjckgs0as286kugasv85af/83665762555.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/47776376367.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/letupofejutaxil.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/mopige.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/45550220746.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/tuguva.pdfIn PDF document text
    • http://allasclub.com/campannas/file/xabalozumuvuko.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/zutakakexukaruj.pdfIn PDF document text
    • 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_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001013a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 10792 bytes
SHA-256: 6f1258da77a31c7559ea91476c8818224ddc0b73c9735ce30ce2920349d19fa3
font_02_sfnt_off000119d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 17244 bytes
SHA-256: 640a70a279010af19b7491848ea3baa142002f01a4bf2ec3ab95691378c33d20