Malicious PDF — malware analysis report

Static analysis result for SHA-256 386e7b483c5a9b9e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 14:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b768dcb4bf351655089295e104e0a33 SHA-1: 4960dd9e52fa7ecea6f37a90e2269231afc4abad SHA-256: 386e7b483c5a9b9e9ea6319002854ff5bb1ea02a0618241c3a6a8793d700efea
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The heuristic 'SE_QR_LURE' indicates the document likely instructs users to scan a QR code, a common tactic in phishing campaigns to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=qr+scanner+iphone+12+pro+max
    • http://zimmerei-possert.at/kowolabuzotutedixisozaw.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a055fc115b79a81c97e91e2d2c1d0462/67633719301.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147087adf26f---vuvemutesuvitatego.pdf
    • http://avvocatoandreabruschi.it/userfiles/files/15920187668.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/pl02nhh24igb652lptigqodh3o/31207271342.pdf
    • https://giridhareye.org/ckfinder/userfiles/files/luseropadaga.pdf
    • http://dxqzx.com/ckfinder/userfiles/files/20210913_230634.pdf
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/fixovisawedesab.pdf
    • https://www.cascatai.com.br/ckfinder/userfiles/files/36561819281.pdf
    • https://biographiewerkstatt-singer.de/userfiles/file/3088843322.pdf
    • http://bwlpsalisbury.com/uploads/files/23966029870.pdf
    • https://peoplehelppeople.net/uploads/File/votif.pdf
    • http://twfbs.com/ckfinder/userfiles/files/lixowukalod.pdf
    • http://tomaszskiba.com/userfiles/file/32298033950.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef7a7e12d6---99145767929.pdf
    • http://brkvinc.com/userfiles/file/93127945557.pdf
    • http://tns-china.cn/editor_upload_image/file/jugutinupowotefixabimu.pdf
    • https://libertyrealestate.in/ckfinder/userfiles/files/13404799347.pdf
    • http://ativn.com/upload/file/murupe.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141274b3bf57---46093173933.pdf
    • https://cope.lk/assets/media/file/61703731886.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16149e285ad726---1065453246.pdf
    • http://yomamasushitogo.com/uploads/files/wulenebezejawarularejo.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_off0000b124.bin
d040637d446c897711455b642a0c869f29d4cab6d86452398e7cfdbe2e9b9d77
pdf-font-stream PDF embedded font (sfnt) at offset 0xB124 10828 bytes
font_01_sfnt_off0000ca0f.bin
5a0b929ab121148d1b6b066e231ca439e23570db5bc6efdfeac9ddb2c65649f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0F 17624 bytes
font_02_sfnt_off0000f6bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 16792 bytes