Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b956e21307a5160…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 14:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 799a12772babd920415217e57c6243f8 SHA-1: b33cf729aad62e4aa2eb9f9a96c57d2ac184aba4 SHA-256: 6b956e21307a51601e0a24af42905e0077984c8edb153dc8b448c3bf73189c2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the download or execution of a secondary payload, contributing to the overall phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fulepmark.hu/nyebu/fulepmark/userfiles/file/67743144817.pdf In PDF document text
    • http://15881588.com/ckupload/files/lemes.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614468f64d979---36282483573.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/tabiwudab.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/lepiperi.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/wogoxoxupunanukisuwalesi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161398060807ae---9253848533.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/97383987978.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/25605632576.pdfIn PDF document text
    • http://chinazzjx.com/d/files/rajod.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/15594091805.pdfIn PDF document text
    • http://ippon.lv/uploads/File/27050717148.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210928060559.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/sidolenazuxusub.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/dilukosutonebatagoru.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090720445328.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/tosimonemi.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/vunoruwofezobevezebezebi.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16147050258967---borebiparuf.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/xetukego.pdfIn PDF document text
    • http://air-ned.com/uploads/files/vumetabotifobub.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/4973261114.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94928000719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+user+not+receiving+texts+from+iphonePDF 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_off0000af08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71F 11108 bytes
SHA-256: 4288b351c27949895b67b8f86dd7046935878dd63d0669bc53796defb61e9daf
font_02_sfnt_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 16900 bytes
SHA-256: 10b16bc14fabc43a94f910f5889d97783bd245a1bdaa6449cc892433cbbb2c0a

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