Malicious PDF — malware analysis report

Static analysis result for SHA-256 695621b8c0573204…

MALICIOUS

PDF

82.2 KB Created: 2021-08-20 14:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 20357d5b698253587913de4cec4312e1 SHA-1: c5c5b1a68b05c4531e2c8254dddf353639dad14e SHA-256: 695621b8c0573204d5a19a26101d63bf4fdbfc120b886da74345a4fed7aeb186
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://garglob.ru/uplcv?utm_term=l%27oreal+colorista+bleach+how+to+mix PDF link annotation
    • http://akicgiyim.com/userfiles/file/dupewupiruxagewe.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/kudafusugepusuza.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/rogaxoxomujenozapixidijog.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/1536d4522940a4f563c356fa5900a120/mawuseto.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60baabef22---79176959239.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a8dea11de---petanifotozofuw.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3kvlanrigepb0h0k7lfcn4qba6/40851923399.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210515024808.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/83295646695.pdfIn PDF document text
    • http://gr-chem.com/upload/files/84634795154.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/46756266887.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/sizogobavaz.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/83361481296.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/kimolurokuzixasetuja.pdfIn PDF document text
    • https://digireg.it/upload/zekarobubujesiravuzak.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/2a363d486362b5ae949220d5d0a0b616/90719720012.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160d605415a20f---vutumupasupunenepuxamisu.pdfPDF link annotation
    • https://textosolutionslinguistiques.ca/upload/editor/file/gejozinokexet.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b8aeb8c61---54555664090.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/h656eanh2khuivj7mhrn588ja5/bimobofemapikanalasurax.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/354e9914f6f64a6c7b3c393c12b868d9/nerovotidem.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/rimudumezik.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b26c621d5ba---tiduvuxow.pdfIn PDF document text
    • http://starlightcelebre.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/dimidujor.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_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 16704 bytes
SHA-256: 21b1ef6b21b059e10779478549037c3687485ec2c16e48f5d86fa19f7941650e
font_01_sfnt_off00010829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10829 10712 bytes
SHA-256: 7da2df39eaf8c58fbfdbe1e0e234d720da3b4f6b692ee381532eba8028663630
font_02_sfnt_off000120e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1