Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9945732b847fa6c…

MALICIOUS

PDF

89.0 KB Created: 2021-07-07 00:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 853dc2147add00893c4c81c0cedda59b SHA-1: 2789624930bfcc2e7cb3927d3956d036174b064f SHA-256: d9945732b847fa6c99da94e3f6523901458c1bd4ceb5d98362314440f1d3bdd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple URLs, several of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the nature of the links suggests potential for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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 http://adamslakeband.org/userfiles/file/53692984872.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6eecac560---gifuwokakogunigoketevanu.pdfIn PDF document text
    • http://hkalc.com/userfiles/87140169542.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d543f2f1945---vabirerefifar.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3ef6273e80cd4044b0ca946385d9e01d/suverevoralajetiror.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/68011468460d3e55b3986d.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/potifokijiv.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/19c0fb8a4017519dbb40dadede6f439b/4246994152.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ffa5d32f8e3d1f322beedb4f4aeb1153/24146343737.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/87332825002.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021052314064529387.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088be5ed377f---68456683738.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098867257d64---nidexipimawurajodibese.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/d86b60ccf2d4842d34e429f8f82190b7/magunateweruvubukizezujos.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/5122617810.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c9667e44bee---gefik.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/mexaterapapamobiwazosa.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff09336ad3---61155786392.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/waforofojizosudatawivo.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac81b45f3---34234977844.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/sns0pcjoiup11ilncmvibpv9th/74634700496.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/pisavufowovapomopetomut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=land+of+the+dead+full+movie+free+watchPDF 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_off0000f851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 16932 bytes
SHA-256: 9317007d950ec30adea1bf5f84ae3dc65a8cbc09a0eb3667128a05c5c4926338
font_01_sfnt_off00012448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5F 10780 bytes
SHA-256: 21f21991f5948e49462c7a71da362792774cc55c014895ce8edfaa7f9bc7673d

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