Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4bb7cb27f34929…

MALICIOUS

PDF

90.2 KB Created: 2021-07-22 21:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 87a793fc26c9b2ff1ca85393a9be01d3 SHA-1: cae0a8c260b09eb9763a233651effe1d795485f4 SHA-256: ff4bb7cb27f34929fdca73cec599367453b537791561bc3aa1fc3e503f1eeb4b
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability to execute code. The file contains numerous links pointing to compromised WordPress upload directories, suggesting it acts as a lure to download further malicious content. The presence of multiple external URIs and compromised CMS upload links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18d68ddf30---34119679981.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cae7e8816---34270928642.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2498a8e5c---5450287724.pdfIn PDF document text
    • https://starbox.fr/img/files/83168491113.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/45789046187.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c21b7d89---60250392173.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/10992237401.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/dupenazanopetofobam.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/11543165303.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/tixudutudipilabiwuwuxa.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f84eb408e---xinukinipu.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/nodojivumik.pdfIn PDF document text
    • http://rinsacars.com/files/others/81785667268.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/3e5122feef7cfefde923040c4f129e37/91032791992.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1d93a87fb---7830709088.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160709e03ec6ac---nusozuponidodexenomiles.pdfPDF link annotation
    • http://synerfreight.com/syner_upload/images/files/2646261296.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/351tccq2ke9k6qov3hdgncqe42/zunepuk.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/jebas.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/votiva.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/29749737192.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/wetuvelulogixunawaxino.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/sadiwo.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/04f956eff1219f78fe79008856c5b400/59775808985.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b81899cc---janowunoxixenet.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cd857f30919---28778532801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=robbie+burns+to+a+mousePDF 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_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001164f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164F 16860 bytes
SHA-256: 742260948c5f020ea6380b013b65cd84dc1b5c98bc88b5748a45670e16d2dc1e
font_02_sfnt_off0001420f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420F 10508 bytes
SHA-256: 7f2c34611d634a5b6d6d85e5f0d3383913e4c2bb122b3e0c813247bcb9b2066a