Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e3af535e663467…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 03:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87c4d06cb617beb0dab1c7a7001f3e13 SHA-1: 5454da81ae00966d893c6ca9cd104f09964e8ca3 SHA-256: 38e3af535e66346777c59da3df8521b599aad4a25cc36d283f05574fc9ca960b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many pointing to compromised CMS uploads or disposable domains, indicating a likely phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=3d+live+love+wallpapers+free+download PDF link annotation
    • http://solamsys.com/userData/board/file/zekedi.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/lefamu.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/67960678516.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9a267011ac3d7630e6c8cbe72ce85429/64118371688.pdfIn PDF document text
    • http://trivio.it/userfiles/files/sinewimuwube.pdfIn PDF document text
    • http://methese.com/upload/files/tibaxazokinaza.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/bewixamutibudikanik.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/89775366034.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/62799114617.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9bb9ece76---49482365564.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311472ceb85---48698917692.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140726f57b40---16010472364.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/69423488135.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/61156907727.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/mapawevak.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/98326365225.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/32904671577.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/xafivatejilasufulutipawud.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210910135543_yckk4r.pdfIn PDF document text
    • https://cardolf.ro/files/davelot.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/dekebase.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/66846333357.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/gasava.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_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 10620 bytes
SHA-256: 6e8ced1cf7c03f322d94180b0cf091c04cd038d7210b0d175fb39d7061e30910
font_01_sfnt_off0000e1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BE 18280 bytes
SHA-256: 1df18c7cf7b3a31931a374867825bdccf7155d22849007e0dbd58dcbd30a0e20
font_02_sfnt_off000111bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.