Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54cc651ff372669…

MALICIOUS

PDF

89.7 KB Created: 2021-07-29 22:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7f6c0c9f30fb867d4fb0a9c7758f95b8 SHA-1: 1ef0f6fb85585d27b83ae791c7382b639b0cb113 SHA-256: d54cc651ff372669497d9d64997e5a59931324408c1b566c839390d48c45c70a
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of a 'download button' lure reinforces this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6a9afee08587f30788a8c7e2ebffcb80/nimurenoletesolalix.pdf In PDF document text
    • https://floridainvestment.cz/files/file/xiteromeve.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/22103684586.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/38111909677.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b3fdff0d15---15218555055.pdfIn PDF document text
    • http://centromp.it/userfiles/files/95620721948.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609152b06bd9b---77541956831.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/tanopenokig.pdfIn PDF document text
    • http://camera68gialai.com/uplaod/quangtri/files/16257515654.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/5mtuvdej3rj2jou94koob2nvs4/roridotuwujini.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8d3e81881cc9c68bb35057ae46130f72/piwupopogej.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///92643888244.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/48959877646.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4acba53416c63891d55304c76f536ff5/14536761458.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26e58c3a92---werafu.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/kafobivokejalenozaxikas.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/dc75454e104bbd1e2fbd607c92148efb/58394287288.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210609_9C3F4A4E4C32DCE4.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2ad2cbf3---mipitowonitaniza.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a775ffb02e0---60496267935.pdfIn PDF document text
    • http://bjjiffy.com/upload/79180671391.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/34139643542.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/7imm6l0l22s574em3usg238ag1/69931114620.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/xojofoxerimenagewasor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=teracopy+3.26+key+onlyPDF 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_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 18192 bytes
SHA-256: 64dda4431fbe71dafeaae89127f1ac9eadf1b46c1ddae28a346d3f81e27d1c08
font_02_sfnt_off00013edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDC 10704 bytes
SHA-256: d6ff764b18136774188b675de4ec4927e3ac8528f01bda0658a3204d201a2bcd