Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcb175f45975896…

MALICIOUS

PDF

93.1 KB Created: 2021-08-11 19:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 15ad3d2842fa28aba07264a82876de63 SHA-1: b5237eae34d7639ee5988a44d03ca81be59ce956 SHA-256: fbcb175f459758961e813e5169e23bfe401d0df2df79e06c8a3c95e6ea8673f2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely contains instructions to decrypt a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the presence of numerous external URIs, many pointing to compromised CMS upload directories, suggests a distribution mechanism for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jingluo.net/uploadfiles/files/81532418344.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c4da224f87145b8b1f71e83cc3a38d55/gusuwisagoxo.pdfIn PDF document text
    • https://majubesar.org/contents//files/jamokepibarojupef.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/wobunupil.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/93780573919.pdfIn PDF document text
    • http://sivam.pl/files/file/gofanabe.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc3c6d2448---18741333823.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/46575980236.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/29450003740.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/0fc50eed5e94501ab363edc959b8120f/negusebezomiw.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a7b369a6e8910ae5413fb5541a589868/kimaxabogusugejomizowofav.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3e689e8ceea51e06fe72cbcb778e13db/59639735527.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/bud3b8t7genuj2m6u6vdaaqvv2/dekugigaziduverixajomuv.pdfIn PDF document text
    • https://bczenekar.hu/files/file/77961958162.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/zuzukaduxesi.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/zajid.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cff75e9a83---5412455174.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/77264015859.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/wewegegitoxalixubo.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/78623261048.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cb334564c---65663250579.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/xemuz.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/wubuloremese.pdfIn PDF document text
    • http://93564497.com/userfiles/zoziliresufibo.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c6effea97746c31e820990ee892c2538/mifinutom.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1c55ce2e1d76bdb84a6ae436a7aa8c7f/90939662095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fl+studio+11+producer+edition+zipPDF 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_off000105cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 18248 bytes
SHA-256: 28137ecdcb087b29218c5dbfbe6a25b085806156bc25184edd9ac80334514f4f
font_02_sfnt_off00014d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D81 10532 bytes
SHA-256: 60a8ee8685272c3381b4449785172718d1d4f1ce3d2c95e8b755de82e8514ec0

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