Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b626ad422276c9…

MALICIOUS

PDF

110.4 KB Created: 2021-06-11 02:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7cdc04c3e18fa6f1384d97f63611a3bd SHA-1: 00e8bfe9197a4745bce431f826a24a48401b7bb1 SHA-256: 16b626ad422276c9410f710adfe6297be4fd84adbdb0e0dfdd34f3a928655f35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading malicious files under the guise of a free novel. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external links and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medvor.ru/uplcv?utm_term=premalekhanam+malayalam+novel+pdf+free+download PDF link annotation
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acce2b3bfd---tubokafojunixemigalag.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf8fa4e0d---60206048789.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609650a9e9cc7---jataveromananazamunebalup.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160829dae1894d---vajixokejizuxoxumolelorij.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/44615398268.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/896fb28f5f0bf69631a884907ddb1d46/77116885942.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ldir4uis6ags6ic2na0rfuunh7/kebaduzolovefagajoseriko.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/c637bd562839904fc361e19891b88f84/duvibenetul.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/i6f973i5pbcuas1og2rffr1tn7/mipibogolurule.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/32334965359.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/56561787715.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/kiputunevezigexuwidow.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a129de0e3---gopelifupavumoluk.pdfIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001091b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1091B 24308 bytes
SHA-256: 86e61b1dfeeb2b7556c82a6a4db84f57b55ce352c80e9da3d2ce81676fa0de58
stream_005_off0001785c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1785C 20768 bytes
SHA-256: 09bb6d8ede0835e87df6363e90b1054b891af9f6ad79926ef70c440294ccba56
font_00_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 5084 bytes
SHA-256: f11bc65d064e609aa7f2270464719a7818583a1700e3865d5f92646c4cf676f9
font_02_sfnt_off000150a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A5 12104 bytes
SHA-256: 2ac727b0f1878d0beb7b14267e37a7bba3ce572808051feb631b24292c6e8e24
font_04_sfnt_off00019b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B0B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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