Malicious PDF — malware analysis report

Static analysis result for SHA-256 308233a04ee1ced9…

MALICIOUS

PDF

88.1 KB Created: 2021-06-27 11:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 86da77059787708ba88d9653cd28ef27 SHA-1: 72feb81d5f8a7985abccac615927a49e37bcffb3 SHA-256: 308233a04ee1ced99399b1a27f964f3a65a7eaf9b0fa7a8155195d396fbad626
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple embedded URLs, many of which are unknown or point to potentially compromised sites, reinforces this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aa3e5c93a---49896963131.pdf In PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/pk8rq5fie3kal0en68kphqn50m/bujejaf.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/82015258744.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/p36v179ghmhcd1pfbm9i7kage4/zigarudevamuxuvepegobi.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/80c2f95255b7d068b418fc3242e16aac/49603271706.pdfIn PDF document text
    • https://irantruck.ir/data/file/wazezubi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/s9ibd1vrubrq7k4rv2m1hek8oa/65343689121.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/3d0018c16d86e650f70c77f6712b3f84/xagusevatopodafije.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/sowuxizena.pdfIn PDF document text
    • http://msiutilities.biz/documents/87630625200.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/54226334540.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/731a5d9c3b9ceaeb1739c642506d4f18/33760618976.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072281f17ff3---dozetumofozudarutafum.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e903deb0f5---demafaxu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29bebc0143---26375915984.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/widoguv.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef90c8a37c---sefofi.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/v4cm8lah8vtl141n5ch9hla1ad/55771132960.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608668446ddfd---4818407151.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/0vi3094i8d1lkjl9lq9ula37hg/rufevogunovotad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=essentials+of+classic+italian+cooking+by+marcella+hazan+pdfPDF 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_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 17912 bytes
SHA-256: 4f950d88c6b4fc4b185ca7462e25d0b3517c68cbf10422d40d6f4f8f49eff210
font_02_sfnt_off0001387b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387B 11456 bytes
SHA-256: b93b16b5888e324ad75a466f9017745b83e05bcdb4cc2ca03753450fe10e4f24

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