Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1476f554762189…

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 14:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9de1086ffa84378537813d64fff5565e SHA-1: fa0b38fce548ee2c6084f7ec58718d1fd94229fb SHA-256: dc1476f5547621892a51982a6452ebca25fa279a68e42ae35ec29ed9edd59b86
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised websites and potentially malicious PDF files. The presence of multiple external URIs and link farm indicators suggests an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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
  • 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://pixomot.ru/uplcv?utm_term=differentiate+between+hardwired+and+microprogrammed+control+unit PDF link annotation
    • https://aartipalette.com/userfiles/file/libev.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/56573266743.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160783aa59fd70---84885115971.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/24052140606.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/f577f355e7ba14307ebeec98c691990f/makeguwijegemuguzavu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f1f6c874d---kagivuletad.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/81004866401.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/xiwafuwejuwa.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/junolipogitubojovu.pdfIn PDF document text
    • http://babamoleskine.com/files/file/xalesebejud.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/28927735254.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/6e4136cc1dbd66bfaa7c2e485c1b9560/47501097698.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/tetawuwaje.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/xigamerutokuxuvave.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/30d0b6450b52e8c6a215a30a949608a8/17345677211.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/pixasizerigagedo.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/woxafezodaduziwenefek.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/fogoge.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/81738852657.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/2368693488.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/55432469783.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/37cdb8cc2f576865449451d492b6a050/rifamaworomulez.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_off0000b95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD175 11224 bytes
SHA-256: f02c3bf95de876242d26f9b0a3afc31b84a4c4a2b27db2174834963661fcf02a
font_02_sfnt_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 15860 bytes
SHA-256: 5af26cdbb5be7be8c38ff966578c5a9cbd94e1e65bbaaa5eeca2f78195287a3a