Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5aefb6f97e7d79…

MALICIOUS

PDF

86.7 KB Created: 2021-08-23 11:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ebce19003f5327d206d63beae9ca724 SHA-1: e6ec4b6f0b84b54b60969ec90a80cfbe9e4b105c SHA-256: 6b5aefb6f97e7d79cbca6cd0692950c531e0a20e930a33d0d5b62ce1cbf1144a
156 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 numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to drive traffic to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixomot.ru/uplcv?utm_term=most+common+symptoms+of+myocardial+infarction PDF link annotation
    • http://banhangcongnghe.com/upload/FCK/file/41770843317.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/fulinumimejoxogu.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/lupemefamozojenuwemofe.pdfIn PDF document text
    • http://dzbnf.com/upload/file///96089494282.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/falutovofitikudidijel.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/1520748376.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1003c4308---pixazidapiboleki.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/774c517e2c3c53b39b5c23e70045efa3/pimimo.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/janabeti.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1c77143cd---tetawifulep.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c605e2de4---51500006589.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gasux.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/vufuduba.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/290fc92f7afe0447884cc9377a92c4b4/36660797753.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/bunefasabemejabijilurufa.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c18eead207e6b633601edeae238458f1/wusadasafumoxemozobowu.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/14274599630.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/66671575633.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/14733491915.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607060004b488---45119611125.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bc2967507---vitatiz.pdfIn PDF document text
    • http://rotang.net/userfiles/file/rozewegilitimefujala.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/pakejopimoguk.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/273cc4571e7e9b5ac5c4295c99b131c5/bavovezenuveduwizix.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_off0000efde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 10756 bytes
SHA-256: ee951ac775aa73675eae532e08535162dd8a6c3b9eaa51760f091831bdb15e4b
font_02_sfnt_off000120b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 16660 bytes
SHA-256: 1c5001043467110b7a0864953e80a56faa4e60a3840f52260f427733aa1800e1

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