Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49a8f61c25c0836…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 04:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8fdb733b9a5fa9b7dff4a64ac1a11c67 SHA-1: fe434b27f80d54a0f6945e0d4d9b3c1de5e3a4dc SHA-256: f49a8f61c25c0836130500417a36fc234443b3797e2cb15dc82224d666177b2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ieltsadd.ir/cache/fck_files/file/magusowalagononebagezewi.pdf In PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/80392327698.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/gemakidafo.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/28323127018.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70562553f7---biximamumuzaxejapiwirab.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/wevoxelim.pdfIn PDF document text
    • http://termocity.by/pics/files/depin.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/38744440953.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3760f94f7f058c0ed264e1cc2c9c71b4/tudegiwoga.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/8g4960dnlo3aa7ofpd8p3vefo3/28917357253.pdfIn PDF document text
    • http://pneusmarene.it/images/file/69740247362.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/julopupeminadatewuteta.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/tizasutazanofikif.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/nedokibekafanakofiti.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/tusaranupagudo.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202107230552233056.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/8dcfd91ddf08fce27f63f6224428fb2f/jivabolapuxurowadek.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/db17e3193cd02f9d144d152f5f0facdc/nuxineneme.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/20479971205.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/20726011498.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/17116363756.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/mexavebofoposatusokito.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/80606296185.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/26d39ca57fbc57d73861e5ffb0c6d74e/74299045016.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/juxojofilijewim.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ddgsftea8sndjtkm6unkukkhsj/domuzawob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=places+near+coorg+to+visitPDF 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_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 17908 bytes
SHA-256: c5ed1038ff80ade11a312de4e15d484f161963e940aa4b4b98cd79a090d03964
font_02_sfnt_off000120ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 10472 bytes
SHA-256: ee2bd05e924150168491a66061e586ee26a65f951ce72091bccd2035b99d0890