Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7829b81a0ef9f4f…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 21:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05a42cfcd0bac43d42bb9901368bc521 SHA-1: 42ffc75edafe6e7c18757676bc7852c762af1e89 SHA-256: d7829b81a0ef9f4faae52b5263e958ab11d2fdf771634fe8973cd60622c56aad
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to obscure the ultimate destination or to leverage SEO poisoning. The presence of numerous external URIs and a link farm indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://parklanehotel.asia/userfiles/file/96376612224.pdf In PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2869b2a9d1be185f40d33ea30e37045f/9637154520.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/256989770.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/wuxuxawamegiso.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/64191944104.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/afbc3a185c342f3eb6083bc30c410d41/basijovumesimuxu.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/50496969428.pdfIn PDF document text
    • http://kunbot.com/upload/files/turagozuzamib.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/84602092460.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb28ba6f4b8---48107818176.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160accd610a6f3---63073312795.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/297c0130910d8c76e793d9eb93199574/58318734826.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/76f72fb1f1e3631be6df8cd4a535a081/watoxefumevunubav.pdfIn PDF document text
    • http://short-story.ru/upload/file/ridubolulurulo.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23da2569f---radesexam.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e62d515b5---98830947682.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/3b4a24699514fd6b68e3a40440b9c980/32513815111.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/8ff30ff9deb18959cb091e7c9330b5bb/tesujuzigajupirakovuv.pdfIn PDF document text
    • https://starbox.fr/img/files/tomezunake.pdfIn PDF document text
    • http://stylekd.ru/files/62597917750.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/69674425002.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/79076136910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+connect+ethernet+in+laptopPDF 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_off0000d27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27E 17376 bytes
SHA-256: 49500de15b18a0f07e5b0631b4fe0e572d3bb65c22f0de0eb3da1129fbc5b048
font_01_sfnt_off0000ffab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 10380 bytes
SHA-256: 5cc94ee2ca4128f39c267e3202949ae53b0afea6b2b3681a79054eda20cca69d

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