Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e2d89a45db46af1…

MALICIOUS

PDF

82.6 KB Created: 2021-07-21 13:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8dc511429c5afcf2659e2e4f40d78bae SHA-1: 22d01b901ca62a545ffe3da795c7c8dfbaa8df07 SHA-256: 1e2d89a45db46af1ae1d1b5d8323f431e7f5e86d9384f745c37fe781fcb0911a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple PDF files hosted on compromised CMS platforms, which is a common tactic for distributing malware or engaging in SEO manipulation. The presence of numerous links to potentially compromised sites suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://kaies.cn/upfiles/210607051137767451vc7xlr.pdf In PDF document text
    • https://dienlanhhonganh.com/images/pic/file/xitolinulebovupe.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210614214557.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/23440779261.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160733db2d9763---56684878451.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/fco71o3im8p3fqkq6hanmio29e/tasijo.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fe6b1f67a---19054727269.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/hlo5ml3t07h354ctev8s3h0mn3/jeset.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/rewidivonuzonadevupumin.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/mekirijaresat.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868626404a6---52453907769.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/35322696229.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/23bc074034235a8d85219bf1f32ca9cf/wuxowigupimigedavegediw.pdfIn PDF document text
    • https://peterdegendt.be/file/66588215895.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99d12f6ac---8139536772.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/kofajen.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9fd47f522---16917853320.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5b02194d7916836bcf7923b63f192bfd/pazalutipejegaxim.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb830b055c7acbf50d0126bf569baac5/molubigebi.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/58023629681.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/fidewaseralef.pdfIn PDF document text
    • https://noventa.cz/media/files/file/20466056546.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/mogufijefuta.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/32871779692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=3+examples+of+first+class+leversPDF 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_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 18392 bytes
SHA-256: e388f2f8b5f3a075576c2ebf6a03022fab59d1318cd1e34733a93c229734d25b
font_01_sfnt_off00010c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 10780 bytes
SHA-256: 3a9c18829b008c24d674f81a2d3c4b4678e420eb5c057c4ff9a4a988218dddc2