Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e2110b41b191a18…

MALICIOUS

PDF

86.7 KB Created: 2021-09-11 19:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49c84454d9c276a2a7a70d61c354589c SHA-1: e5c99c0198afe4747688ce242a399d43ca210366 SHA-256: 9e2110b41b191a1841218378c1b21a20ec64046255e48f102c9092531efb392f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a significant number of embedded URLs, many pointing to unknown or potentially compromised domains, forming a link farm. The presence of 'cmd.com/data/files/' in the document text suggests an attempt to execute commands or download files, aligning with a phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://verredistri.fr/xmedia/file/dafigi.pdf In PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1ee53984dc6c2dc040ea75e3596a843/73888631196.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/sepufavisutetip.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/xubezibazidataluj.pdfIn PDF document text
    • https://cargobull.cz/res/file/relajam.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/kumozejerujironezidu.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/48736421285.pdfIn PDF document text
    • http://qdcmd.com/data/files/megakekiwajefosukam.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/64783704310.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/nudipukunigabawexuj.pdfIn macro / runtime command snippet
    • http://boxethai38.com/upload/file/satakutewebudoxufebe.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b0762ce72---34575986863.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/bugujevatijunovi.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/semidajuguxu.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/03533aa091271ee27b49347479c9954e/82369995036.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/09afadfe5d4f5cf76a769f4caaf126cc/97252702359.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8784d1f4---99874461558.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/liwoxotenopoj.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/gebivokofonavipumupi.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/favosodemukubewowemes.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/doladega.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/66532748927.pdfIn PDF document text
    • https://florerialIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=no+root+apk+hackPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/75663318263.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_off0000ef7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 9996 bytes
SHA-256: 5f295694f9dfa005d9ed2605cd0ab2cef0b6fa9c76ce927b459c37c5f9ef5109
font_01_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE9 18376 bytes
SHA-256: 718f36b637af65b9cea11f3b09cc656d7a1f01bbc2bd4ad2cbba1d48a66f63fb

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