Malicious PDF — malware analysis report

Static analysis result for SHA-256 531446429bbd279c…

MALICIOUS

PDF

75.0 KB Created: 2021-09-17 20:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 949ae2246102ea623c3c5302d1eaf37b SHA-1: 2e95c50b451c5a02c86ff90c11e48e04332b9cc8 SHA-256: 531446429bbd279c97acaf5678d041557f2870ef442d3893ed0364ac0b03e814
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 https://invision.buzyhub.com/files/46165329834.pdf In PDF document text
    • http://konferencii.org/web/uploads/assets/file/74382170002.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/34387738266.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/kodorapikox.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/wevilil.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/16302404499.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/34120098148.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/52571900679.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/fomuzikoretogozox.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210907193019.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda8c1ea96---39936475960.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210904_901D797490C6F250.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/poxonutirexabokojekix.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/gezebusaxadi.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/17432610098.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/dav2fnsfqdjgcvoknc5jluhgp0/gulipimedewex.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/rabugilotuw.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/wijuvugiwedex.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/guranokedubojirugerasuni.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/6738247265.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/4852188433.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/354e39134bcf30c65bebe362895e30bb/37637336872.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/pewerelozemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=motorbike+games+2020+new+bike+racing+game+mod+apkPDF 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_off0000be17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE17 17868 bytes
SHA-256: bc0a89ceae8fcfc4c33c1fde3ac3f878cec021eb9ff0f0a513d7a8f9c97d55f9
font_01_sfnt_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 11364 bytes
SHA-256: 86d699493a8ec006d3d3f5af695bb2a6428c938dd75818d9b11808311b852c35
font_02_sfnt_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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