Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b7084aff393118…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 17:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0baeee76f730de89d8997eeee2cfce71 SHA-1: 35c48fa21018e6726ceb7ad7d5458c41d6ec36b0 SHA-256: 37b7084aff393118d04f15b5d284e92a3920047ac14131f68310952857cb4e2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating an attempt to leverage SEO tactics for malicious distribution. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=real+credit+card+numbers+to+buy+stuff+2020 PDF link annotation
    • https://hamayeshniroo.com/shop/file/gasavebogatowolujopudeze.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/084c127c06fdc2e3b266493636476a12/23589494056.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/duvivisusunurerid.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/59377151861.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb9ca4e2af---tugifavukutu.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210916_31B6615FD4AD2B81.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/gosenekabugajegowijajuwa.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/37f2732c77ce81ee5e1bee81b564959a/1038068365.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/dovaxexukoki.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/16410758534.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339ac149a9d---96273939833.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/6359578218.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/79118286559.pdfIn PDF document text
    • https://biomisszio.hu/tmp/kebuj.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/kukawisuposexesusifafuwa.pdfIn PDF document text
    • http://besteva.com/upload/files/nevumivagugogawojiduvak.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/c380c6ce8fc3866880de0887e5a6fda7/64947296405.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/30904178498.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ulqcauk3fv31dgfmtocuucp8fq/zujuzotifof.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/50327622295.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/24552287954.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135aea81cbf2---57602821654.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210906_45284FA52E62B1A3.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/jurubabixog.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/giwanadun.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_off0000dfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 11276 bytes
SHA-256: 5bcee771b79e4cc752b6f2db45588b7d003504d062b4d69f4ac8f01c0b39aac9
font_02_sfnt_off0001126b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126B 17904 bytes
SHA-256: a0cf1aaebe6fdc6d7f32cc1874197ace996cb78b7140a35e87abc19324a82c42

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