Malicious PDF — malware analysis report

Static analysis result for SHA-256 4360860393e7ab2b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-04 11:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca7e3eb8616ce709a7680d45e9b0c21b SHA-1: 919610a003c2d796c7a6a263963002560e70e91f SHA-256: 4360860393e7ab2bab846704a148ae31127ab39e1e300882180d3ad0fd1e663a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the link farm suggest an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=fallout+wasteland+warfare+campaign+pdf PDF link annotation
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/4f58edb75d951fb42ee4cea8a4cf411d/fobizozilogelusutubi.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/nomitumixugoveki.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050113541419.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079cdd34b877---34139035941.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab63ac1b018---33410610243.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads//files/202108090552198882.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e0a17f090fc5d43fa2c4771ee2bb4bf9/87343862617.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a585aea8704f7a54575d5da446c3b26d/wubavudopowema.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/koo77ghn6u380rc2mc557bto0e/jujujafe.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/sasebamukusozezizek.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102c780c3f32---tiripixot.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/rofawogejuvo.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/69526350015.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f68b0a16e47---xakit.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/vukrrkbolje70hk1jmtsb511h9/pirabetosiwuza.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/10fdb7a5671361bf49b7fa2076258779/subitop.pdfIn PDF document text
    • http://castel.lu/userfiles/files/buvosunivijefug.pdfIn PDF document text
    • http://jonme.net/ckupload/files/20875418864.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1848f69ef0---mitipovumawidunib.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/0f2fd7a1c9fe3dec00f08ed08519f834/31138300146.pdfIn PDF document text
    • 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_off0000b0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC907 11128 bytes
SHA-256: 2a4f09f14cd8632785345eef25f5c2935de89e2ce7116e7a5252bbe5f5c09339
font_02_sfnt_off0000e2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 15676 bytes
SHA-256: 35ebfe1592bec46751fd2cdc8e7054e5a1c7aeddca088cac834f7b7469f64045

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