Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfbfad72cbf33181…

MALICIOUS

PDF

87.0 KB Created: 2021-07-03 00:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 79a36dc04fcc3d20ac10fa0278e64687 SHA-1: fd411a6a4dc3bdb435e5b8f4458e33dc1c005457 SHA-256: cfbfad72cbf33181e668c9151e56e543d4e6b12c07d5f895fb9744dd5c36a4ba
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. The SE_CLICKFIX heuristic indicates the document instructs the user to press Win+R or paste a command, a common social engineering tactic to bypass macro restrictions. The presence of embedded URLs pointing to compromised CMS upload storage and disposable hosting further supports a malicious intent, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/6483050c3cc565712d8f8c06766123cd/69871735378.pdf In PDF document text
    • http://kapelski.pl/userfiles/file/87956158408.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/71ofq9ulep8v78nvprlqm7rek3/25469482563.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/84484764420.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/14879616428.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd4d238c07---doximotid.pdfIn PDF document text
    • https://scalper.ir/data/files/file/7895401268.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d4c09cc69---37424047531.pdfIn PDF document text
    • http://calliopegoodrich.com/clients/73417/File/wewogenip.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7327bfd0b---14272818992.pdfIn PDF document text
    • https://shopabrang.com/images/files/62619484521.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac81bf327f8---52734640638.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2f714b304---towusesimelevinaroxe.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/t23r9m1u5u9vf6o7k4hm6ujn75/18284185803.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/16274362390.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/l6upt7318tdvt8rak2255aqd70/mokokewobebogogoxufivi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e24a5dfe9---beboxomugolejinapu.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1623921453.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/wuvifajilolufuneritozeso.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/75967ca8bc2b5816478ae9625fc4b257/zizipiriwipogose.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c14ab699904---98813097373.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/a11519e8596bb0cd70d26831e83ed5f9/getokiki.pdfIn PDF document text
    • https://webmenuplus.com/images/file/33176854174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=windows+cannot+connect+to+this+networkPDF link annotation
    • 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_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 17848 bytes
SHA-256: f003951fe82aac209021ce29a51adbaea57efaba0042496669566848401e7133
font_01_sfnt_off00011e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13681 10592 bytes
SHA-256: 26c18752f827037d2903a7ebaea563a5f963953c3de12968ba08127cd9c5afbb

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