Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d85ba338b9962f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 16:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82da218eb0967a4c702ea0da7d6fcf08 SHA-1: 4216b504f2e0d7d53542940c306a09a845eb6a26 SHA-256: 43d85ba338b9962f1be70f6045313f48f15a24f9f0298fafe5092c14367eaa62
156 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 numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The presence of a link farm suggests an attempt to direct users to malicious websites for phishing or malware delivery, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=caisse+d+%C3%A9pargne+android PDF link annotation
    • http://nwatchonline.info/userfiles/file/pavudobitapo.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/94995778975.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613996b8c3210---vupobafodez.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/jekatokakaxov.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/buxodezewav.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e459228491b27f398b34831a22eb7f0a/7907169476.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6504dacdbdccb27c6cbe166ab4a4c8f2/kemirejojanox.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/64810082215.pdfIn PDF document text
    • https://zhansq.cn/upload/file/96791752683.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/taxusinigevexafekewuvevo.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/tobefobezatixogimug.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/60548542244.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/begokif.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/85495866523.pdfIn PDF document text
    • http://elpijisystem.com/file/fagoxusekugino.pdfIn PDF document text
    • https://derfo.info/resimler/files/94248366698.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/27584942506.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/pozifereditesara.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/14426395079.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/80425156716.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/19524336139.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210912_A53E3627BF47B166.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/3f67369dd819e59aa93d520369afed53/52946095859.pdfIn PDF document text
    • https://sim2007.com/files/bakuvorolelu.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/lijagaxabel.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_off0000d889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 19796 bytes
SHA-256: ea7d1b378284e9e7e4426dcf9225b32ee3ac50c2f1138b391f5a626f8c580f40
font_02_sfnt_off00012345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12345 10608 bytes
SHA-256: f96e5b92cc98dcc7fec86158772be47b8c01b97b53ba6dafd61357008b556055