Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e13b095a1c58bff…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 16:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 93428921426481dadc53b28f37e34704 SHA-1: 64a9ee5a50845be24884d5aad58eb9627cfc45b7 SHA-256: 1e13b095a1c58bfffae47adfb98941c37dfe48eeb05a7dd7d2d5fe0ed1cb8528
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://fnb-concepts.com/images/uploads/files/55347955117.pdf In PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/11835695987.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c328f0c744f---42927002688.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/9cabc18be1d6c98b54183ddcedb90acf/49305664685.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/rakerifezemor.pdfIn PDF document text
    • http://polletnv.be/uploads/files/17149893125.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021580431912.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/pozubizokilosezugemilulib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cb9b6884f---24825288034.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210813_114624.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/pedewuzuxefaximimukeseto.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/14808068505.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/bekugomitegatukuvotulin.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d60450bd8a4af3c883af020f78715433/54149708055.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/36000027479.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc48d33a03---dixupenotojumel.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/gedozazuvegige.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c32ffd070e7---93323428965.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/vizadiguk.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/53784552688.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/pozef.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b8f6f390500ace0167b58ba6d5ad9d44/3151261111.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/netikovujelap.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/xonejegumusut.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/vuporurixe.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6fe4a8e7f08311d329b80b1b11b34baa/35316143235.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/78004180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=or%C3%A7amento+geral+do+estado+2019+angola+pdfPDF 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_off0000ce19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE19 20344 bytes
SHA-256: 792886da2ade84720a79f6e6c8448afca2b68622ee3c14b9ce4379b76fcd39e0
font_01_sfnt_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 11432 bytes
SHA-256: b5c52c138282f3904ed251e5a661859a95860a0f8bcdfa6f17c6f1c6d91ced7a

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