Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44fccbbfb880e55…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 14:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9eccd31d316b8e4002275993d1aef5b SHA-1: 5eff3500c7440d807b47994d4f0a902a61070950 SHA-256: b44fccbbfb880e55f35326bde7ca61cc8e7bbfb5b7c81c6c6acf4c5f16653d3f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous external URIs and links to potentially compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crewmak.ru/uplcv?utm_term=type+bangla+in+android PDF link annotation
    • http://avvocato-callegaro.it/public/file/94478464122.pdfIn PDF document text
    • https://renault-service.com/userfiles/96770705923.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/gedasarujuboketotakaw.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/kakipaxutasuk.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/52599105729.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210907182320.pdfIn PDF document text
    • http://skncn.com/u/files/musewoxelesanemale.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/motozizamamo.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/47505471757.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3dce376a42c1c02ea731d8f07c72e354/38960140420.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/gufimuvonipa.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/xavuxiwumo.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/tepinafujemupufuvarobil.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109131720541053.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/fodujemifano.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b393eb749---jamujuba.pdfIn PDF document text
    • http://didopack.com/files/25153259289.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/navafuf.pdfPDF link annotation
    • http://goldenagegroup.vip/userfiles/file/20814562793.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/7609681812.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/jaxufidamitileli.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e9f56a9477ef7d19e727ed7a87f16b2c/77348030548.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/14293665659.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/39954143909.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_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 18376 bytes
SHA-256: 0b0e4eacd5a0337e7d6d41c2d9adddbb5437699435eaf99173bba3eb1c384e60
font_01_sfnt_off00010664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7B 10516 bytes
SHA-256: dc0fd83a0a4c4189129568995f0a9e19f3e9c6539454231fff76d778fa7bd6ac

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