Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b3a0e03f6e8a4b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 12:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf80f2e16af4993154ed7c7687c3de82 SHA-1: 3f6ff14eb4e3a33b7c0757415314b309957f6348 SHA-256: a3b3a0e03f6e8a4b5fa4bd69d3be0ed7ad38a98907c3d31ce7bed3327c20c35e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The PDF structure and numerous external links indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=count+and+write+worksheets+1-50+pdf PDF link annotation
    • http://botosani.ro/img/uploads/file/zuvepuve.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612cffbbcef4f---76527510447.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/jelezejajafenukavezisisuk.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/190530b1b4df59689a69888a33e3e701/95417439241.pdfIn PDF document text
    • http://medi-sen.com/files/files/paximaxalejowuzarifiti.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bb8a8486e---56601089879.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/75773250242.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06b343b3b---48940951231.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/99233916921.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4dd076914---popawubadidizi.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/88035211806.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084763f82068---pizeteresesoxidilolonedub.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/9vne3dec9glp4eur1isgnril74/8103129786.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/hg93isg2qvk51j86ksf4j3ol17/xiludexe.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/waturasopap.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c15a1e2f8---58077710649.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/wejeg.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/rowene.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/pemututoverowuxewaruda.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089cd648f607---vuvixev.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/cq9u6id8unjh8lass2o2tgcvmv/77107984513.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dbcadef64---71735885291.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/minitobalupenid.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_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 17396 bytes
SHA-256: 5b97b652958fd0fdfc554fc50249b62f96acdac3a3c1e049934f2fce81556469
font_01_sfnt_off00010bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 11200 bytes
SHA-256: e54042c6a3a0d6546288e6271dd6b0ce5b5a8efabc141f610f6d072c6613f0b3

Open this report in the interactive analyzer, or submit your own file for analysis.