Malicious PDF — malware analysis report

Static analysis result for SHA-256 67df95ee71590762…

MALICIOUS

PDF

74.0 KB Created: 2021-10-05 15:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 71de6a25dcbd619419ae21c250aea3dd SHA-1: 548cfb85ff9e6fd8d370e235c959c1e6ef62d956 SHA-256: 67df95ee71590762baad65c799b15eb3cf326e928113be0defcad7454b892c2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple external links suggests a redirection mechanism to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://laborke.ru/uplcv?utm_term=prop+hunt+fortnite+toy+story+code PDF link annotation
    • https://mehreganimaging.com/images/upload/files/vodukigibiside.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vexob.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/ponesawe.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/57324210257.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae3afd7695---wesajatomesofekaserobike.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/53959962342.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/13042955563.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/nufoxefa.pdfIn PDF document text
    • http://rs-entp.com/upload/file/37286178631.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/3535e44dd34e9538d89e1f9e72f0b00a/sunam.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021100512011680862.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/36604592066.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/jotafomo.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/zulome.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/ragejeveti.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/pukodajofulowujukil.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/nhi9kbug8i1ib4ujru8tvv2uet/28760860215.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/jigomazopoturusubaso.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/natiroromagidinurupujoxo.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/dijunelasisiku.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naxakebozazoxowefar.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/79576009714.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/mapemuka.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/96612282727.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/bekopokilo.pdfIn PDF document text
    • http://bakoca.hu/files/file/rejepalikowupeluno.pdfIn PDF document text
    • https://mimpidia.com/contents/files/vigaje.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_off0000c01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01E 16504 bytes
SHA-256: 29556cbb4c6be6dfe2e9f7942ae2aadc4b93ebc1d60867495137411de2c7b534
font_01_sfnt_off0000e9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 10724 bytes
SHA-256: b5e0691ecb3d70b839596cc5122cd1763ff0cbbfa1100c962075ac52aa43d251

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