Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ec16f55730b3ab…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 13:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0046d8647c9cc063c68665189540d0fd SHA-1: fb7ad678e52b19bbd12f3164c0f7cfea0bb10127 SHA-256: b1ec16f55730b3abb38eef7df00f3f4967c51cc62de1ddd5173f09aaf30aa12c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to potentially compromised websites. The PDF contains numerous external URIs, including one that redirects with a 'utm_term' parameter, suggesting a phishing or spam campaign. No scripts were extracted, but the overall structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=game+dewasa+hp PDF link annotation
    • https://balticstroy.com/uploads/files/vuxawerimaxotot.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/karikipik.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/lojegibe.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/23591208453.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/14683047387.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/65984712242.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/87916137853.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/lepuzegokon.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210907073001.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/tedazinene.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9166443aee5f509c9c2cac9aab15cacd/gatimegoletaduvizefifefad.pdfIn PDF document text
    • http://rsentco.com/upload/file/71854969076.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3447429662.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/75743662703.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/13189022594.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/5434032976.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/zakuvisetaxi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7edee94a44094a68b232bfce5776f735/jigamiduzusa.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/pakuzibapifazev.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141387861f4a---61821051719.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f95e82c25---zudikenamojut.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/didufilorogokemomumaxarit.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130630713c15---69848483656.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/35877930449.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/jesetozajigozerefo.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/doleb.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_off0000de51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 16656 bytes
SHA-256: 6b059a737daa1b7d62afc0789c0b7b89c913345c65fc0c0cb3bcb891896c9a88
font_01_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12179 10220 bytes
SHA-256: 9303ba673d21c99e7da057cd2e40c2d309cf37d16f43b70ab0ea241dc16c702c

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