Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b70a6983ba8ac32…

MALICIOUS

PDF

68.5 KB Created: 2021-09-08 04:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: c1cf26cb5e8a2fddd99e83595249aa2b SHA-1: c71396156e8e42209699e72105ed2783ad342852 SHA-256: 4b70a6983ba8ac32e32c02629308e12d7a705e384c7c7019c1b6c7918e619cd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to phishing or malicious content. The heuristic firings confirm the presence of external URIs and link farms, supporting the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://huntic.ru/uplcv?utm_term=pdf+to+word+converter+online+free+nitro PDF link annotation
    • http://toonesk.com/upload/bokira.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/81267985813.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/lovudajomuv.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0a26107bc5a47d18a58221a333c45d06/8420255198.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/vubojezegaxiwapatub.pdfIn PDF document text
    • https://baongochoa.com/upload/file/30224034715.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4bbf60e51---wotekapixarob.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/pumoko.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/87837851617.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16102e06c4a998---migupadebupezetu.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/f5frdchs89hj1rufn3qurrsiks/sirom.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/47777382563.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/31974508446.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/sujodulipigedelupidujaj.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceb4fc1736---getekemogewe.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/70157843075.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763bd3de8e4---wepubu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/uked25qknq5amfeucvrssnaav0/25192761621.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/nekeliwutugegajozezorune.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/61942269649.pdfIn PDF document text
    • 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_off0000aec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D8 10292 bytes
SHA-256: dbca50059c7c66baa51b154d856092814e7c667f05e3f96779ac4ef4a197bf09
font_02_sfnt_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 15312 bytes
SHA-256: d4f618f97aa1e899bbf51e836ba77ab8dbea74f8a0fd2e1fc4a92a311da6b670