Malicious PDF — malware analysis report

Static analysis result for SHA-256 21379210e941a725…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 18:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bacc9b77a7259051649a19f4126e480a SHA-1: 0719824f1b906cf73643b13ccd488e35d4f5e862 SHA-256: 21379210e941a725e30b4e5f6c087d9ee364bacefc5080f60cb6c2d0918deb96
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to solicit sensitive recovery secrets or private keys from the user. While no scripts were directly extracted, the presence of numerous URLs, some pointing to compromised CMS upload storage, suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://turismo-galicia.es/ckfinder/userfiles/files/nofoturagabewudiluziseni.pdf
    • http://orem.mn/uploads/files/tiribuxonogugibamepi.pdf
    • http://jjw-led.com/userfiles/file/vapotolujorafi.pdf
    • https://yapluka-services.fr/userfiles/file/48749123961.pdf
    • http://trip-sale.ru/userfiles/file/46050105212.pdf
    • http://cmrivestimenti.com/userfiles/files/xawozekemuduxatig.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361068824bb---duvamameziv.pdf
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/xusetes.pdf
    • https://airshow-bg.com/file/64440229656.pdf
    • https://texigo.tw/upfile/files/2021/09/05/43978876603.pdf
    • https://strongpointmarketing.net/userfiles/file/98024398059.pdf
    • https://ferest.ro/imagini_ws/faroxujakodaraxurejawes.pdf
    • http://hferrynetworks.com/FileData/ckfinder/files/20210904_5156BF193E5FA12C.pdf
    • https://onecre.com/images/content/files/jesilofurizowebi.pdf
    • http://weiddy.com/uploads/files/202109082342369850.pdf
    • http://skrutit-probeg.ru/upload_picture/file/28210171699.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/idudp5mvmm73qh0q32o6hnbrm7/85674050188.pdf
    • http://chickendaylacrescenta.com/uploads/files/welakigozanepefeguvunis.pdf
    • http://gpsputhuppally.com/userfiles/file/58030992430.pdf
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/xojalomaderakagitiwiluwog.pdf
    • https://turasmobilya.com/img/editor/image/file/85523249728.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613724391d0c2---juxofibujasi.pdf
    • https://dom4m.lv/userfiles/files/60696241102.pdf
    • http://varadimasszazs.hu/uploads/files/1596078330.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+create+debug+keystore
    • 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_off0000d4c3.bin
5fe636d3b771ad0f2a07820867e58d91f770b5433a4811ad4153056113029c9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 17148 bytes
font_01_sfnt_off0001019f.bin
b78cca69d877f5baf7431640b6d162c75e39b34ee586478acb97bc86e823ad47
pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 10928 bytes
font_02_sfnt_off00011aea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEA 16792 bytes