Malicious PDF — malware analysis report

Static analysis result for SHA-256 1388ead6cf5db226…

MALICIOUS

PDF

87.6 KB Created: 2021-08-23 13:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fd8a90ffa988042e0fceb6b8b6937ef2 SHA-1: 4c6a89ca6fed79531702ce74bb7a7e65dbcf474a SHA-256: 1388ead6cf5db22617ed47e5c26b9fe448debba348b92ec6ed2cbe3a7aea6b0e
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/igrdhfl71h84m2crb3m6kobu6s/97414466900.pdf In PDF document text
    • https://gachbinhduong.com/upload/file/roxavunexe.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4cefcd7e0---wukazinixewujir.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/9323729581.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/98687497445.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/mewunajiduxi.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079842028ff6---nofidavezi.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7ufor5pgrq5jtgpkpge69n8m12/venimisutuvofavizinowoko.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108002c40dba---vafoz.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c736146e3f4---badesokusomuwobirelepare.pdfIn PDF document text
    • https://duel.pl/userfiles/file/leregemafivewemekin.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/8056606890.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5lkmvv7tdndo0qsgpkh2h2c851/womikipezoxepuzipeg.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68cefa77d1---8552599797.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c36f2b89bb2ea07ee5ecf93fb68c421e/51285439506.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c1f8682d22---71739041184.pdfIn PDF document text
    • http://mopron.ru/upload/files/10059706905.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/kijuxapafopajogujaxo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dd2de08af---zemilu.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5u6lmr1sosljh4oqsbs4cir9mo/naxegexudekad.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b648ae8c0f3---82655686491.pdfIn PDF document text
    • http://cosmoscm.com/contents//files/3166273063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=five+paragraph+graphic+organizerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 17468 bytes
SHA-256: a95cde52db92da144b7d695a6ef62ef636c13e3b233cce73e503f1c219d14624
font_02_sfnt_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 10444 bytes
SHA-256: 391a93b2f09f1f638f7fd3771a3d0fa0c17ac9cfa7f50ee4e0c3e1430b101cab
font_03_sfnt_off00013aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA3 16084 bytes
SHA-256: 629677e45faedee601e08dfe5d93bed8cb2cbab2933fb40e48fc5543807047de

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