Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7d0668865e809a…

MALICIOUS

PDF

77.7 KB Created: 2021-09-09 07:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 263f222497a390dcd15ca836e61d4fb7 SHA-1: 8b089a2fe7ff0fc8ab46487449b8675b525403b3 SHA-256: 5c7d0668865e809a2f06202d04ba165df85aa6c374d469e19917a5537acf56ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/23a40cd7167a9ef4ab74c088ee541e1d/nugosudelazivegiwotudozo.pdf In PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/17c443521a2fe67e4ffd76c3137f1930/jedidegu.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/dopemubipunodirazaf.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/89750022629.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/39456754914.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/52b6022285e1c149a1acb5132b394e01/puxuzutovibutaxo.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/11511731178.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1dde13a512579b6b5ede72631dd58825/mokojodewinufujamupif.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613499a596ef7---43674013672.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/xupiparelalunevujojijuju.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/pololujatunufotisamifur.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/85869611540.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/99408210167.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/57822415808.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/vulenib.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb474d9041---98524123689.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/74068032578.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/kalagenugosivukagupuki.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/38928820010.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/61740674441.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/xibawatigifub.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/nusaluvagopefo.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/7170903934.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/4723553564.pdfIn PDF document text
    • http://rubensova16.cz/files/file/71631603239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bioscope+prime+mod+apkPDF 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_off0000c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 10572 bytes
SHA-256: 0cbbd785615e7b8377d5bd455e95d44439df79c424605616ab33c18d73ff3974
font_01_sfnt_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 18540 bytes
SHA-256: 710e70c3aac107c71851ba2b02f8df8012534d490a95bfcfff82e8954941ca27
font_02_sfnt_off0001112b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1