Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae4bd4c105f346f…

MALICIOUS

PDF

72.5 KB Created: 2021-09-03 17:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d1fc6a3a59f4ca1cc9f26fc25b5d38e5 SHA-1: 81636f76fc4646acd35ff55b2357ff97a9302f3a SHA-256: 1ae4bd4c105f346fe7dc4ff905113756427efcdd4259a602ae1b22f930fbb5a5
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised CMS upload directories. The PDF structure and embedded links suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://biomassasia.net/data_ed/userfiles/file/vusabofiwinojoxivol.pdf In PDF document text
    • https://amrapalispot.com/userfiles/file/belabowaremipotuvokifosal.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/viguxede.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c475d21dbe9---ludufuxevewinidofulefi.pdfIn PDF document text
    • https://irantruck.ir/data/file/malebaguvorapebowenam.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/31232281324.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/72602973799.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/gusatat.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/24626119357.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608250addffcc---rusutanegerimufidunewibe.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073be74e0be2---83164711601.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/40258939350.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/narimexidukasarijetavogu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/9f56f9300ff789277566a54ee71b1202/wisonezorifupujol.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/v7qrtp7s28kct9qvq82a4opjju/rajiwewesizaditazosis.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ea11d6dea68bab8e89b19d4b7c9b2bc1/94830376423.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952b938057e---86900884922.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a592b08f1b1---19629082746.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/vupulaturodorimole.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/31850871447.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/46987425728.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/patewexu.pdfIn PDF document text
    • https://0900107678.com/upload/file/16793469092.pdfIn PDF document text
    • http://www.bandungmesin.com/file/fepokuravepigizumoladoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=free+worksheets+for+learning+alphabetPDF 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_off0000b798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB798 10932 bytes
SHA-256: e7bc8e38d53b9e56474bda18968fddb230e25b8dd52ec4d279402f405ecb167b
font_01_sfnt_off0000d0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B4 17032 bytes
SHA-256: bdb71d3e7539664d1cd7d3518df937323adc52710418fb1c86bd82509137b299
font_02_sfnt_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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