Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d7cae9fe6db910…

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 00:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 271eb2ab954202412862961e651cdf8c SHA-1: bf177753a06166d7f317700280c7e52594332051 SHA-256: 88d7cae9fe6db910607f4aba23a1ac730c62928e56797e90e47051542654441e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that redirect to various domains, many of which are associated with link farms and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to direct users to potentially compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=android+file+transfer+agent+mac+uninstall PDF link annotation
    • https://drproperty.in/userfiles/file/fesobigukagelujufesaw.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/winewosoz.pdfIn PDF document text
    • https://hyper.oneewe.com/_img/files/barubi.pdfIn PDF document text
    • https://hobbypet.cz/files/file/pagifukopabora.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/gemitibanutupezekaribaj.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210904134129_378230265.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/kemokinupipoxu.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/50283808519.pdfIn PDF document text
    • https://phunhai.net/upload/files/49145847961.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b914a24b28---xadaxa.pdfIn PDF document text
    • https://cakkue.com/contents/files/jubijojapizunuzalipes.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/teketutonivaxim.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/xesanavugiposujozuj.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/bisit.pdfIn PDF document text
    • http://tarp.longi.tw/uploadfiles/20525005916.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/49493805699.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/nufugevonew.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/cnp241h2lb0q3op5jvv9o9jj46/kosajagubofibomivu.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/wavavugozusi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/87d9228b151ac9bfcb1aacd1433b5d1e/zupivigavoruwagi.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/tirutogubewidune.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/kuwalijazexizuj.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/luwupo.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_off0000add9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F0 10900 bytes
SHA-256: 82540829611278b5ad3f1359af6bc1fb0e431b2d258ada0f04bc9fe0a76ec9f0
font_02_sfnt_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 16504 bytes
SHA-256: add498aa2a37cf7ad155d487aab352311569f878d50df845c8581483c20ebfb6