Malicious PDF — malware analysis report

Static analysis result for SHA-256 9913a684eb9769da…

MALICIOUS

PDF

77.7 KB Created: 2021-09-02 10:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4116d0f655a27228141fa424df7ea09c SHA-1: 5690770b3bdce4f7e138586639348d5027c686a3 SHA-256: 9913a684eb9769daa76d2a1b6df969021755af0e5b27b32bb40c09c180a31317
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous external URIs and links to compromised WordPress uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and extensive URL list point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=i+love+you+baby+and+is+quite+alright PDF link annotation
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/n9fpaaq5iqskb7mgedqp0ihdi1/nuwafogul.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/tedalinotezot.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/gawezewe.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/4680243886.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/84186260847.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089deb6bbb1f---sasivanixojopujoponu.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/21cf7819e015fd00abc09023a68ed31c/67490850886.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607146d81f5f0---nuwiwasabepegiduji.pdfIn PDF document text
    • http://medipharmacompany.com/userfiles/files/mizogukumumijagexabo.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/duduzu.pdfIn PDF document text
    • https://energooptima.hu/upload/File/wiraxim.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/42809161374.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/72531466233.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/86b5r138c2smt4srtv0h8l3tu1/nazejufozupufawexaw.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/93781962737.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/25587096779.pdfIn PDF document text
    • https://airshow-bg.com/file/vofevedovomasekovife.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/5a7b2df5dffb50ed52dc8e71c89b61bd/42686646544.pdfIn PDF document text
    • http://ropesadventure.com/d/files/boxajegux.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160858ddf53845---zurarowu.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1843hjlv657k99f7ev2ti5cjkj/69138624654.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/lesigafavedekunuzekuresu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d04c9316a8b670c1fe6be6988ac3d2b1/13790987529.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_off0000ca9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 11044 bytes
SHA-256: 90bc295b96108a839ff238b5af78fa3fd44c035a092e02d2fa81dec9beeb4b79
font_02_sfnt_off0000fbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 17272 bytes
SHA-256: 07a8fa6ef5eeb80f9ea565f030efc9a3575c12d0ef68ef1e442b33f1e557cf6c

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