Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac41304843b54d75…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 05:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2863472765a62daff519950256f2fe69 SHA-1: cd398b067f383a4351b303f96a96988407e0894d SHA-256: ac41304843b54d751a0c8f24122c51bd5c50a86f00e507e862f6e03dcd1cb5ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised or disposable hosting sites, likely intended to host malicious content or redirect users to phishing pages. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a deliberate attempt to manipulate search results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://zhuoxinlaw.com/userfiles/file/20210907095729_1983782584.pdf In PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161347666dfc7a---81340121033.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/7951203231.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/puxidikofewodof.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/wefejoboja.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/gikovilifujiwukekadera.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/6c53e1cf1732f564244d668f5db6318a/raborixasujarirogu.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/69289914312.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210905230459.pdfIn PDF document text
    • http://aquatherm-graz.at/files/wuvaxejugejaribokijogos.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/4229638040.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/roxetutuga.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132e03c7dd17---legowogojofutut.pdfIn PDF document text
    • http://cabini.it/userfiles/files/31121357860.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138fa4f75ffb---topusikazoxa.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/86480859684.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/supudawejofutivejag.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/294275206.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161319a8fb981f---nukaxojuzopes.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/raginob.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/zorosorejolewoguvuvigo.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/70937883057.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/80809417252.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/batozakilosonanutovamu.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161338a161691b---25040502303.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370e94cd9e6---49617909217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=hot+song+piano+tiles+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_off0000d672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD672 17588 bytes
SHA-256: ea5aeac3d4fe4bcddb649c62d5cd095efa5eb6e8452f2894c6f96decd66db740
font_01_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5A 10720 bytes
SHA-256: b6e4b1b666acffdcbf9e8236f6cd5fac1a8f537f64ed54b571d031af5a591be3

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