Malicious PDF — malware analysis report

Static analysis result for SHA-256 9310cc1e4b7654e1…

MALICIOUS

PDF

89.2 KB Created: 2021-09-04 01:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cabade2381d2098b5012008cbcdee7c6 SHA-1: 47460ba4d1ed3179564189c8b166f907bbfcf629 SHA-256: 9310cc1e4b7654e1aca62d514f8add4ee006dbc64bd8a8980b87556ea1df6c14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://gongotour.com/FileData/ckfinder/files/20210701_EAF9812656BBF9C7.pdf In PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/denewimaxutegakuguguno.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/joxazubinudufesiwiguz.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/97606657819.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/tugoxudofuzupiwojisufaret.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/zivuvilumovugojuxemuxad.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/27151361371.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/11882982271.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/34755084668.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/gafulor.pdfIn PDF document text
    • https://medtek.vn/storage/file/pagaguxixuxigamidekas.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/76800905669.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/42205205287.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/tepugigunesetu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076399393287---bipubitozafi.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/zuxafapimarizejene.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/55160366501.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/75322541391.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/95974494440.pdfIn PDF document text
    • http://klpa.net/userData/board/file/zabatirilunimemazejasan.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/s7lsaqnlii5te2id5jcjkik460/nenunezafaxon.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/medezizofevofez.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/42012897741.pdfIn PDF document text
    • http://spbi.cz/res/file/xekovazemufejejuve.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d454dd2790---wogokubewanevodutamedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=davis+6250+vantage+vue+manualPDF 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_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10937 19540 bytes
SHA-256: 81792f81c8f4697cc0537de02d92be129297d18b1a1566efe5fa1b095d402c6b
font_02_sfnt_off00013bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF4 10944 bytes
SHA-256: 26b0f6a38b33e3f8e3882caccacab3bae04aeba575c528cdcaa03dc8b4d6c155

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