Malicious PDF — malware analysis report

Static analysis result for SHA-256 14e887113803c1b9…

MALICIOUS

PDF

86.1 KB Created: 2021-09-16 06:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40c058acc425a8eb309840a124be735d SHA-1: d4340568a68902aa0906fac1e97bbc7a2883ccd9 SHA-256: 14e887113803c1b93ce42e599a7da0a735c218a80e0edfaf746861c1723275c1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The 'SE_CLICKFIX' heuristic is critical, as it suggests the document is designed to socially engineer the user into executing a command, likely to download and run a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613977c485882---39056836497.pdf In PDF document text
    • http://www.toptehnik.si/images/vamegitevejoz.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/getomefilikoxokino.pdfIn PDF document text
    • http://compsult.net/userfiles/file/fexunibuzinigebaz.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/vikevonavilalidu.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/99661060304.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16135280f240cc---tajumejezodavobe.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613935501d98d---tebevatilapiluratelanumed.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/lasem.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/pufofegezovifulumidake.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/99247741027.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/111450337824.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/rabazekefujoxadomejavuwu.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/9901517504.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/majabifexilasixugepi.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/jinogafakasijufut.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/tidezupagewuxanuduxadibu.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/rumaxebutimuw.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210907/file/16310123065436.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9e4dcec9---batepebagowegi.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210915202511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+wifi+disabled+fixPDF 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_off0000e770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE770 10560 bytes
SHA-256: 7329e84a5a7f77d22ca1bed251097008e5d52ab7f1707ff7ce5f8233de85faaf
font_01_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 19708 bytes
SHA-256: be4b4279c44381846f88202297b3226930c3277a29dd61d6ca451b2f08799082
font_02_sfnt_off000132ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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