Malicious PDF — malware analysis report

Static analysis result for SHA-256 372e723534346c16…

MALICIOUS

PDF

82.6 KB Created: 2021-08-21 13:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac1d89ddceca8405c81e382ecb020d82 SHA-1: f3416ce1d6115dbe38df25387a39b3381aa34c9b SHA-256: 372e723534346c16db78e4b4a90d33e9915e0d4aabb35347a24eac3ad1a1a494
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it's designed to hide its malicious intent rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://garglob.ru/uplcv?utm_term=descargar+vectores+para+corel+draw+x7+gratis PDF link annotation
    • http://shinex-auto.com/userfiles/file/misagosuf.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/zivegadavirogomonixu.pdfIn PDF document text
    • http://vtaky.sk/media/file/piporonositexajosumiture.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c69547ef865---kitakaboxazotavomesu.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/gubutixuwip.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/62408496954.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/72850730055.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af1f6254fc4---banodizife.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/kunevowikalabilutuzokisup.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/kekepiwepivimu.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/29d2b9d99345d0edd29b86eca56a1aa7/90213272784.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/47570466992.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/df7a82e6299d7a003469d945054ae15b/pedapokewidegin.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/tetejazamido.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b4eidsrt8569gtbvrflvf19tl3/nedafe.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/wipanowa.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/jugufok.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/36453053633.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebead24222---busatetavovemanap.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081fd2780164---vafalidugixe.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ljpm2ohh6iolgn75ia22f8kr8j/17639272613.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/2311940792.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160791fccb07d1---togovi.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/bedowipole.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/7cq41rv365e005mdlj79tkdefo/nexuzuwelo.pdfIn PDF document text
    • 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_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 10888 bytes
SHA-256: 1f22add9c83f507a06db05bd7862177069b5dbed1b52c4841c408fc219a70cab
font_01_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 17388 bytes
SHA-256: 3f1e912f7d5db83cbc7be40c55cc411480c4a888153dd7831b81e60226f23450

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