Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a22c7f79f9eb2d…

MALICIOUS

PDF

63.7 KB Created: 2021-10-01 00:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68e0837892ead60f76bced80131d1602 SHA-1: 83be1ac8689fc859889f9d092c3459cd71acf27f SHA-256: 08a22c7f79f9eb2d2134416112ad491231bd0aaaae1b6ebd6132d16a4878e287
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting and points to compromised CMS uploads. The embedded URLs, such as 'https://laborke.ru/uplcv?utm_term=android+file+transfer+agent+mac+uninstall', are likely used to redirect users to phishing or malware sites. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5655

Heuristics 5

  • 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
  • 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
    • https://drproperty.in/userfiles/file/fesobigukagelujufesaw.pdf
    • https://hnhaa.com/userfiles/tnejp/files/winewosoz.pdf
    • https://hyper.oneewe.com/_img/files/barubi.pdf
    • https://hobbypet.cz/files/file/pagifukopabora.pdf
    • http://gshosnab.ru/userfiles/file/gemitibanutupezekaribaj.pdf
    • http://busangh.com/attfile/fckimg/file///20210904134129_378230265.pdf
    • http://gamaxmotor.cz/data/dokumenty/kemokinupipoxu.pdf
    • http://dobrejaja.com/Upload/file/50283808519.pdf
    • https://phunhai.net/upload/files/49145847961.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b914a24b28---xadaxa.pdf
    • https://cakkue.com/contents/files/jubijojapizunuzalipes.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/teketutonivaxim.pdf
    • http://ckudzcssffhhj.handysociality.com/upload/files/xesanavugiposujozuj.pdf
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/bisit.pdf
    • http://tarp.longi.tw/uploadfiles/20525005916.pdf
    • http://maremania.net/img_pagine/file/49493805699.pdf
    • http://xn--h1aeekk.xn--p1ai/files/file/nufugevonew.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/cnp241h2lb0q3op5jvv9o9jj46/kosajagubofibomivu.pdf
    • https://harkakotony.hu/UserFiles/file/wavavugozusi.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/87d9228b151ac9bfcb1aacd1433b5d1e/zupivigavoruwagi.pdf
    • https://khambenhxahoi115.com/images/files/tirutogubewidune.pdf
    • https://prestinieurope.com/userfiles/files/kuwalijazexizuj.pdf
    • http://mh-gartengestaltung.de/userfiles/file/luwupo.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000add9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADD9 16792 bytes
font_01_sfnt_off0000c5f0.bin
82540829611278b5ad3f1359af6bc1fb0e431b2d258ada0f04bc9fe0a76ec9f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F0 10900 bytes

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