Malicious PDF — malware analysis report

Static analysis result for SHA-256 5571ea2dad1f4a9f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-12 10:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38f7693fa2b2a6310dc18e61f8aaedce SHA-1: efc74e11ed0d7383b7d9c0ce76be4a03210864e1 SHA-256: 5571ea2dad1f4a9f73577927f90a37751092750e5d80cfaa16cee219513c9fab
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5a76c6c9df8332e0dac25ff0cee87e77/26706786284.pdf
    • https://petpetmates.com/files/editor/file/xozupuselupatoxulope.pdf
    • http://getampedmag.com/ckfinder/userfiles/files/kopujejimilifewadoze.pdf
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/ketogoxuz.pdf
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/83241919279.pdf
    • http://p-itos.net/admin/userfile/image/file/boxigomeve.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613be5dd41874---30836713154.pdf
    • http://z500.si/files/65795906483.pdf
    • https://mastirz.com/userfiles/files/22336948011.pdf
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/54066690502.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/11589826936.pdf
    • http://markaz-e-durood.com/EditorImages/file/bukeragufo.pdf
    • http://wohntraumgmbh.at/gitiw.pdf
    • http://vattucongtrinh.com/userfiles/file/lopewerasuvowowame.pdf
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/68885728969.pdf
    • http://anbao.vn/uploads/userfiles/file/34506738738.pdf
    • http://showplus.ae/userfiles/files/didab.pdf
    • http://warehousetraining.ie/images/saredarumebasedexuwe.pdf
    • http://importfoodfair.com/userfiles/image/2021/09/file/17842384533.pdf
    • http://miyagi.chi-kara.net/Upload/files/basakukozatebivep.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/961f77e8178eca82a9bf60ef3b2f6351/nodelagarovopiko.pdf
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/pevoribugajidor.pdf
    • http://sxhk365.com/uploads/file///72595257648.pdf
    • http://telekommarketing.com/firme_data/files/wogedejupodegesutaseloro.pdf
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/jeminuxevowibojul.pdf
    • https://aimtronu.org/userfiles/file/vekoxefemomolosejosivefa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=experimental+probability+worksheet+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_off0000cbcd.bin
6f2909d1b226653fcc1dfb5e3f8e4f67d3d3c8bf698c2a1416b8728a8a4d209d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCD 11280 bytes
font_01_sfnt_off0000e5ee.bin
be6dcdfdb857c62a9e6ffcdaf10b736dec28353b1a4177104751ea372525bcdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 17508 bytes
font_02_sfnt_off00011357.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 16792 bytes