Malicious PDF — malware analysis report

Static analysis result for SHA-256 6419e46be9823768…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 01:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 225a55b9c41021885daec7934dfb989b SHA-1: 4d23ce40e1059cd55ed4a08aa2cbca4b56e48cc4 SHA-256: 6419e46be98237686c2947a53f2d1b42970bcee913bdaf72f4f17e2f5836c2f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://allytemp.ru/uplcv?utm_term=how+to+use+an+apk+file+on+android PDF link annotation
    • http://emeraldcovepartners.com/_data/images/file/bevodaniget.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/28597747233.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/sabegutovaromexupebij.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/7615231419.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/53063292806.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/ramorudo.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7ri7e2ktgjmb28i0km33v5kcu4/damesategepaf.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/danevitipokeroves.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/pulovajosapu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a003e1dfa---vovawijamibibirevovo.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/90248448105.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/38384390824.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/79141622532.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/74329196361.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/57955093211.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/84474664840.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/25674117446.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/79592926919.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/29763257950.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/nowanawelagadojugimorika.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/16484172563.pdfIn PDF document text
    • https://unitjaya.com/contents/files/kofefozebuninufe.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/nasogikogogoraliv.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/30641035656.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/bekuzitesiletepa.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161427a5f492ca---birovoni.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_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 10760 bytes
SHA-256: 3e4aa9c25c939ca3373f9f0d297778b2182ba18ff464856a160801b368c24ec4
font_01_sfnt_off0000fc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 17212 bytes
SHA-256: 4784e8869504c15b72a3675aaf53e6c8c5bc2dec68ef3b35dd6e08f553b9a08c
font_02_sfnt_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1