Malicious PDF — malware analysis report

Static analysis result for SHA-256 772a56cd2188e923…

MALICIOUS

PDF

76.5 KB Created: 2021-09-09 19:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d274bf6369a29d90edc02480d7f8534c SHA-1: 0251934e6ef729fd9b0287771e21a23e8117b742 SHA-256: 772a56cd2188e923e87a81f60ea652fb64470a170f42397a855874120fb4f994
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary URL suggests a lure related to 'android proxy app free download', indicating a potential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=android+proxy+app+free+download PDF link annotation
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/u8af3pk8u7vq7p8lfnf3o17to6/95752012678.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/79331293877.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/36168282262.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/30652521564.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c1b719a8d7d99e8fa940cefb043d4429/17484195817.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/pivasurugemujibud.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/zakudurididaku.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/fiwufo.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/niraja.pdfIn PDF document text
    • http://whatdwellswithin.com/file/61975708374.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/kafanuvafojolujove.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c45996cbe---bimumagef.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/21340484710.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613675ff08bfd---24872112888.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/94842733296.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/28566635109.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/67290980189.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6888426e16484325c05970de2a56288e/kilezore.pdfIn PDF document text
    • https://cristalensi.com/public/File/89913728468.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210903101950_56khba.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/58888131775.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/nuxikizam.pdfIn PDF document text
    • https://afayl.com/userfiles/file/lagumagelodexewizudu.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/43855331564.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_off0000c4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD10 18296 bytes
SHA-256: ae3777f0e3e920934739559da2b57855d13d9cd7ad150110b0983c13a7c94ece
font_02_sfnt_off00010cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 10508 bytes
SHA-256: 8b5ce1c1f58f9e34e6a9f14f78d4a32de4324df0c9bee722c38ce97d9c40ea9e

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