Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0327063549a7fe…

MALICIOUS

PDF

93.9 KB Created: 2021-07-20 17:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ade0761c25bb4b84ed8f4f99994c045 SHA-1: d8fb80e70e19485d997f55cacda669ef93e93a07 SHA-256: 8b0327063549a7febd0fd639a0527842a9a936309783c3dae8c731b381392920
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external websites, many of which are hosted on compromised CMS platforms. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2648b0708---60218677414.pdf In PDF document text
    • https://fairtradeportal.pl/userfiles/file/24988454500.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160df495431274---99803367982.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/d9f14b627827eb74c27102acfbfac1e6/38564189839.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd0b50e32---22328613067.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a96cd781e42---80497018485.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/8b254aea3c8dc64fc69030b533817d34/jonazogojikoduwutokelov.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210704_11CDDE8774882903.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/58f9ff4a4bb688655520e49d9d17ec02/68942033506.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210516164234.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/fafb5542072b096fdee9bfd9e34421b5/35228412709.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/84075333508.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/2ca607d875e18b8feef433a33ae454f8/88660934251.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/f749d3314e4a8545aeb23f2fbafc7174.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/12337d8037c2e4775fed94090b70b1f8/53462522627.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851e1fe3d9d---20423043514.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/65410690552.pdfIn PDF document text
    • http://fedoro.ru/upload/file/91931433836.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607497ca0f2b3---36957620430.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/35tci23m1lk5f1q111gemdjfu2/tudowedubik.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084ff28c3d57---30419643950.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/3b334ce6e02e2d931f8640a1f82b9450/97381984678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+much+money+does+a+lawyer+makePDF 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_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 10828 bytes
SHA-256: 115e4a3716269c1bbb4caaf82a232a66cb7f868133691eb4f995ce274130a342
font_01_sfnt_off000124dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DC 17440 bytes
SHA-256: a9ba563fa4e1060e1cb9ad2cd87818db200eaf9d2b2b1ea14811e1606acac096
font_02_sfnt_off0001527e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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