Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d355c82eb72d9b…

MALICIOUS

PDF

83.6 KB Created: 2021-06-25 16:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 959a8583c2ef09316b68ef7226fdae4e SHA-1: 3fe82e807a7ceadd30c3d938beee9f8ccb111c47 SHA-256: c4d355c82eb72d9b4e218e1c597c37ef66ead36d91db2b289403ff21dfcbc5b4
156 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 a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various websites, some hosted on compromised CMS platforms. This suggests the document is likely used to lure users to potentially malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://huntic.ru/uplcv?utm_term=satisfactory+console+commands
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/3e9c26fb8fc4e02de95cc0ff33f11126/43307562871.pdf
    • http://sequirk.ie/userfiles/file/82364508463.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa91553f1d---51115896170.pdf
    • http://mimarkamilozkartal.com/userfiles/files/gabusirurug.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098756116833---90186724446.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824cd07a1de---timubakigawakiveb.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a6c1394dc17ecc9ecdff6101b3036655/vobudefem.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/4b6d360d6e6f2854474521ee3cb65f38/98431704640.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c75a27b60ce---xajubigatenujufex.pdf
    • http://hongdacable.com/d/files/pexutenobenimod.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a4adfe0b2eecb1f5cc1caa72e64e7316/54190004218.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/33ed86a88c51db05a342503b261eb95b/geraw.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a47ee746dea---buvugelitaxozudokatupapi.pdf
    • https://zoomkish.com/basefile/zoomkishcom/files/fugumaku.pdf
    • https://mwasafat.com/uploads/files/powupamopemevek.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc3a90ad3---79882124297.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160ae09fd38b04---4277937171.pdf
    • https://perfecthospital.org/FCKeditor/file/votuwilevira.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070ed320c46c---vazabewa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 16792 bytes
font_01_sfnt_off0000fbf7.bin
7358b69f8d0dcb04c9e59e45b70ddac661a8b1d88b0a54170edef0dfc7883b4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 10824 bytes
font_02_sfnt_off000114ec.bin
f0264732d69f0c177958473b47723bd45163fd1cda4cbe09f0c9004da041cf90
pdf-font-stream PDF embedded font (sfnt) at offset 0x114EC 16984 bytes