Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c3d5c0ecf886d9…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 03:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 68539df272b742ff3dacbb51111e5c85 SHA-1: 58fc825214c4297e81f6a8b4b60c58e5a5a6253a SHA-256: 58c3d5c0ecf886d98a994c48f9d18b98c69a8083f2dc8b1649256e5b3a71a638
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics indicates an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://falconartistmanagement.com/ckfinder/userfiles/files/22941775581.pdf In PDF document text
    • http://louisamerino.com/userfiles/file/4257061320.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161535b38ceb42---forokuxogeja.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/gowokexofumixelixa.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gedalawuxuposad.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/penegubuxus.pdfIn PDF document text
    • http://lachina.cn/upload/file/ganonaxemobesim.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/bijeb.pdfIn PDF document text
    • http://unsersohn.ch/images/file/mofumamigizovanezeziluwu.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/gilavefejir.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/53888161458.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/vitanamoletevepan.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/92434647333.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/39377732177.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161327d007d074---jaletedimitosuzidijekav.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/vinuxutibuxorukifojener.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/7428457579.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/gupofatigige.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613790704473d---39458082822.pdfIn PDF document text
    • http://edallyshop.com/upload/files/likibilug.pdfIn PDF document text
    • http://net-marketing.hu/images/files/kaxoxebibasobimatelok.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/lovowiralerukunimowuf.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/14330359796.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/8195257185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=clash+of+clans+hack+version+unlimited+everythingPDF 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_off0000b082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC894 15676 bytes
SHA-256: 562fa9f8a16cdcfd80492e560678fb99464d8a5e898a95bd51fffec58cb2ed98
font_02_sfnt_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 11328 bytes
SHA-256: 6e18c46a1e992b2828cbfdc45b4796c1ef60c3a56b99130aea9b56767365c76b