Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d12944a785c4eae…

MALICIOUS

PDF

85.7 KB Created: 2021-07-17 05:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 79b90f3bd7676d20d369a818fc3aeacf SHA-1: 409ae680b5c61f993336f53a9c6ef7ad5193df91 SHA-256: 5d12944a785c4eaea367e1f9f0e0df66faf738b95ee1cc65ccbe4b1e6d00838a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple distinct hosts, many of which are associated with compromised WordPress upload storage. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to distribute malicious content or conduct phishing operations. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0d333c4dd---31713646229.pdf In PDF document text
    • https://shiokuda2.com/contents//files/90267260770.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/59050298692.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14a533545---86005235183.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/kefikoxedikor.pdfIn PDF document text
    • http://kokomo1986.com/clients/31029/File/miwiwe.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/be02448b62da39b0bab9415519133c7f/wonefikaxi.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/6817696478.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160822e66ae006---kidivowa.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/43045877205.pdfIn PDF document text
    • https://drsaman.com/files/wejibenomivosos.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/82965965519.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e688178a9743dcb40e5af62bc1996313/vupavumunafe.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097f7c73d54a---30337838054.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/a6ntn575cnp5nij08oc5rpptqf/19597320290.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607666245b826---vagawakoma.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/66018697513.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/96058057505.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870a21a5496---dewomu.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160af85cf31759---gixurexamexojuvapujatexi.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1aaaac59c---kadus.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/431996750.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/fixobagujigetujukoniso.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607798b730bc4---bupoteletimexugaxojobomir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=seasoned+butter+for+corn+on+the+cobPDF 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_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 17616 bytes
SHA-256: 51de7b2a79bdc2f5fa21755e14338383205e99485de5efff5c6ffc8fe456772d
font_01_sfnt_off00011877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11877 10752 bytes
SHA-256: 8f91593246682d172f2b2716905b3afe79494740d9c838b4c0862c3bee552814
font_02_sfnt_off0001311e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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