Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae851ca195bdd2f7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 14:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2e7b1d3b9a551e37f15162c84761b3d SHA-1: da649e4181f68ecda38586683ec6719e89176b39 SHA-256: ae851ca195bdd2f7b7c5949ab3b107f0afb10643096cb04c17c8ff5d4c3343ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically noting phishing and trojan characteristics. The presence of numerous links, including one hosted on a compromised WordPress site, suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://eichler-kammerer.de/39849979843.pdf In PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/bimavimirijamederixukexuj.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/morigetupoxetitututilu.pdfIn PDF document text
    • https://datawire.gr/files/files/gorarawidalijin.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/senasuzovavikivewanulup.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/96124591353.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/fd5cd0e06b657952ce02579dd7ef2e1b/takorigopodedulopod.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/rerivaweritakiwewukomu.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/48278470636.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/22735077307.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/xiwezavipitirap.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630670404.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613551f5538e0---93889487228.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/58739986309.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/48407596178.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/momofalovusenab.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/3810338098.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/xulinopidasunefog.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/sowip.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/3388144300.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/48660662132.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/sefupopafufegizox.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/95161824148.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/pka13qg2o94b9kon8ck55fihvn/76073486742.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/xakebax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=garageband+mod+androidPDF link annotation
    • 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_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 10456 bytes
SHA-256: 94a4848ec87c2d1a3ca77f07c68fcd7e1ca76160228a6c2ea312fed181a4d0fe
font_01_sfnt_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 18288 bytes
SHA-256: b5f3da58722936ac96f564112358f1d034bc741b537ef722afd2262c88478c14