Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1bc41f9c2f330e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 09:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d68e7bbf7f3a5af96465877cecb1c1c SHA-1: 9a6062c60a66d6889a630c06f9278464f4fa747f SHA-256: 1f1bc41f9c2f330e304553e254d8b7cf13a591eeb893be73e3e9d3c5fbfb3c0b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links and the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://eurekaelearning.com/upload/news/file/26589334867.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/f0pngatdgcjv5e116iv6llcru3/58693188580.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160870c6482261---xowave.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c4805f37045---48799746209.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160716fe38141b---72739807981.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090308235416.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/bdf7aa4c52511f4de80e8e9928f45f5b/kivev.pdfIn PDF document text
    • http://eventechsite.com/files/files/lejesusavenifigeb.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/85975979437.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/xujiwod.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/73gd8o1gq763ms4oftsq6kt581/guxexomamigefunivutu.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/18746152335.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/xedisalazijovijizuvu.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/51810044056.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29e840a634---zafupetubeba.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/27407280099.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/74344083260.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0ee975b0---65135942799.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/85034346353.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/zuzanurojufuvozo.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/turugufeguxenutozowobaja.pdfIn PDF document text
    • https://tessuno.com/upload/files/60e8b3ca352f8.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/71bc356a888f166e9d85dc860d3328aa/12322862801.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9c300a81d455c9428d48fbb9052aecd8/60198155663.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/xinotuzepigejifetoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=bodyboss+nutrition+guide+pdf+freePDF 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_off0000d2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 10872 bytes
SHA-256: 1f5e8ab12ab6cf691031078bf55e2f98ccd4c0f523cb0e991137ecc7681f21a5
font_02_sfnt_off000103b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 17168 bytes
SHA-256: f8126928197e0e658f8e8e862e55a563c0bc2ddfd8adb7a1b6af2afb721c9b9b

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