Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c57545642a48f8…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 20:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 744705c438095a31352f0102fb398e79 SHA-1: 8de67e0f028d8093540c0363b6242a11f2dfe06b SHA-256: 85c57545642a48f8a9f09659d13c66e6fb82225bba709336e092b2ca796ba8a7
172 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a malicious site, aligning with the typical behavior of phishing and trojanized documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://huntic.ru/uplcv?utm_term=chatlinx+mod+apk+unlimited+money PDF link annotation
    • http://ssaisarang.com/ckfinder/userfiles/files/3001869548.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/jugegefamenusavapubi.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/gikasujaguwuguvage.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135f4485cb46---64937653804.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab8d191b8---jetenusewujar.pdfIn PDF document text
    • https://anup.bo/images/files/62141846562.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/jomubuzalo.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/sajopiwupubufujavox.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/28184591192.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/96992027645.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/lixepet.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/17953257730.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/xitukoraxunimurom.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/93008593515.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/12556080943.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/80802296034.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/2115153131.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/viwum.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/68867fa78652f9e221c2f41ea3f49d00/nejifijufutokokomalufikag.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a25cf413c---romapidetejuled.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/4048403907.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/58161932339.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/wudexafigasajodagobazof.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/difarodixu.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/imbneruck1ft3jdq2eqemcu776/85380561646.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/14979336456.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/80956699442.pdfIn PDF document text
    • 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_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 19692 bytes
SHA-256: a232791f29e116b11bfe6c923af9628ece9c83a6786553c70aa56c78ec870df2
font_01_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A53 10828 bytes
SHA-256: bffa51bd3fdb8e70cd582446293602b6bbf26c4432291ef559a6b238360499bc

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