Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a357cda1e08501b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 12:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 39a171d94a729d3ecacbfdccc170c21f SHA-1: 8b2e9d2ab9be9777d5b548337f84a0175d9fec66 SHA-256: 1a357cda1e08501bcb6794960af5d71eb9ff321e5e586cb44630af3f54d8d18f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to compromised WordPress sites and forming a link farm, suggests an attempt to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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 http://domainecomps.com/documents/files/74165173314.pdf In PDF document text
    • http://flavourit.com/uploads/userfiles/file/file/278730913.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/99053932304.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/sovefatij.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4163bea7e---logivopunofiguva.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/42203382702.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/68376216fd8362a4606bef9c9747cc59/libonurifap.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/77377423765.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/11780532116.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/pezunufejewevewudu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/l78j3cl2tbqfv6ompn1ofudfo2/11980405074.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280909132092.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/bafofamut.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/gabadosa.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/50463911546.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/29046932771.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/sezevivagudidogosabodejal.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/rutavusox.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b9ff279477fb02daf22c222d6a83f3df/60137963370.pdfIn PDF document text
    • https://lapiadinafelice.it/file/wovapunuj.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/k2e1rjlvnp25u58gf1r9816uh3/kixilokebisajobawirotil.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/bosuwipabaxaxorijovori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=audifonos+i7+tws+manualPDF 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_off0000ccdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDF 20248 bytes
SHA-256: 8fb3ee608b2f4b1c2f15d01557f084060ad5d7451bbaad00657ae7d25bfe1112
font_01_sfnt_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 10500 bytes
SHA-256: 14291f09f00310f7337e6ec99b259589f7f7a95962b721da75f2b4b35e15e0e4
font_02_sfnt_off000118bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.