Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5539fb09a0161a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 01:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 721a34840c505ca4045fb5fa9b4f9f2f SHA-1: 2b226af844e429b3bc758a3539060b535f530131 SHA-256: 7a5539fb09a0161a405f40baa72ec96ae8f3af8272f2834f59d14d2a9e484bac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The presence of a link farm, coupled with the ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged the PDF as malicious. While no scripts were directly extracted, the structure and URL patterns are indicative of a malicious document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7145

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://cn-junsheng.com/upload/file///202198215795505.pdf In PDF document text
    • http://eubeer.vn/uploads/files/97991737321.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/22528417094.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/28193251609.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/teforopolurorenij.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c647e2aa19---pimevunusojepukolav.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/rurug.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/80467390427.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/domodutuje.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/61978308510.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/wulunabi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613468784192e---xupedudoriminagame.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/29849809154.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/wawesopedajeze.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450dbc2f6dd---89072857838.pdfIn PDF document text
    • http://fohow77.ru/upload/file/35602644465.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/26659217398.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/nabizezaxi.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/vabuwisol.pdfIn PDF document text
    • https://onlinendttraining.net/files/zewereluvewoxuxikaj.pdfIn PDF document text
    • http://benrassam.com/uploads/files/labobugaj.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/56668719673.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/wonidarazirujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tubemate+2.5+downloadPDF link annotation
    • 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_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 10656 bytes
SHA-256: 337dd6ca8728772aee3a58db069b463f3f8722006bbcd106fabf77090bb40c7e
font_02_sfnt_off000112d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 17220 bytes
SHA-256: 702180467398050e0cec6824845e0720a4dba3c4e41d1e8bcc6af30daf2e2a56

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