Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fc046127a3d97a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 02:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d0fe03b692d842c1baafa020acba3656 SHA-1: c61efabb14e58fe407d1608e4e78d6c02560e98a SHA-256: f9fc046127a3d97a469014d1a906f1807b98d9fcc82271f285f140787c1437b0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosting potentially malicious files or are part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

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 http://kahasat.cz/data/file/23047183070.pdf In PDF document text
    • https://nk-sostanj.si/files/file/sisatopefexilemabaze.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/13712873503.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614111ab5b82f---batidekafelefagolomok.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/7016050833.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/062323443764.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/39495027922.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613de51ea170a---29840711309.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/0hcm7v87bifd6naisf0a3dhvt6/kegetatidis.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614118aa6d16b---nawugibepokevudixof.pdfIn PDF document text
    • http://moretonassets.net/userfiles/39994726164.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/rugeraxe.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/ganekinavalulosol.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/13205906723.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-13/20210913204238682253.pdfIn PDF document text
    • https://penzion-palice.cz/content/74770744615.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/velaxibasibabekuzejeliko.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/nesaletofirepumip.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/vigugovag.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/65008241026.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/49674618911.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/jabugevurotofoxej.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/vumomoxixafubut.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/supiwesu.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16141116d5356a---robedipujepuzujafigoguni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=porn+video+apk+downloadPDF 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_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 18256 bytes
SHA-256: 9163de66f9737f98de3c7a5ddca2e91b15ec56eeeab5f576379311d6ff451f55
font_02_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 10364 bytes
SHA-256: a7587d0295545aa6afa0daf396d50af9783196c268f21f96136905034446c699

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