Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1b4ed5b09cbac9…

MALICIOUS

PDF

78.8 KB Created: 2021-08-29 17:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5cb4c0e75299eed4175533bc421e8637 SHA-1: a21ee003343af82b78a6f3f4a3eb9eb704ef7181 SHA-256: 5d1b4ed5b09cbac9925f76da286f0ca123a9661adbca89d57a4950270d63d036
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with several links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://drafthe.ru/uplcv?utm_term=5+braxton+hicks+in+an+hour PDF link annotation
    • https://soechi.com/userfiles/file/pirozuzakezufugufoj.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0647bbb481---gavuwijekibosak.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/34506784287.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/loraseka.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/kejitemez.pdfIn PDF document text
    • http://kccmaul.com/files/files/51481375229.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/29083370923.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202166626437210.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/62698181205.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/jagajaxitox.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021081507053080554.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/fiferomika.pdfIn PDF document text
    • http://3sdent.com/upload/files/77676261131.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/silobadigejisubabupise.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/36d6f2325ed5ac8193309d6d1bd81640/ruguvuxumifozub.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/kepizonexerabotatixu.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/o5hpcciarioqo8nr2i014l4ej9/rozakogutafoma.pdfIn PDF document text
    • https://chp-travel.ir/data/file/26931278473.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/daruwe.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9fb6d2a4a5ce8e0813108ecf99d4cade/zavowa.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/zukoxofusevefesejofesimo.pdfIn PDF document text
    • https://ubranni.com/uploader/files/55859966216.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/7886017041.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
stream_005_off0000fb79.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFB79 10620 bytes
SHA-256: 06888a3b7b98decae79d67ffeb64fa996cf035b2bd22c2dba53c47c59ef6dfdd
font_00_sfnt_off0000cf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF07 17152 bytes
SHA-256: f137ed5461646e86dc5d641ba4ddefe8e8a6bad116072256323181bebd3efbaf
font_02_sfnt_off000113c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1