Malicious PDF — malware analysis report

Static analysis result for SHA-256 00d39ac19b357e95…

MALICIOUS

PDF

75.0 KB Created: 2021-06-29 00:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f750206d820497943ba75c58ed5126ec SHA-1: 49736ee98fb2a392f2604671847bfc8ebff52fde SHA-256: 00d39ac19b357e95f459c62b2d2bcb7daca02621375fb13b6363182ec0f898d7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to lure users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=how+to+solve+quotient+fractions
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/13f157efc50c04edc5c536d69c234070/nixeponowibirafufimat.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/93426941446.pdf
    • http://remaining-mc.de/userfiles/file/13893232766.pdf
    • http://artospace.com/pics/file/72466421769.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/63b566f6b75c2989921aa19a8b0c08b8/88809599956.pdf
    • http://esipro.fr/userfiles/file/nimuruwavenexinu.pdf
    • http://chroscina.com/userfiles/file/magepejomizuduf.pdf
    • https://hyundaia.ru/userfiles/file/zutamimukezijofamajanibo.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5p60qjgr8n0v2a4uihs84k2stf/migeluzek.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c94c1459c---57317496982.pdf
    • https://milliondollardesiclub.com/upload_files/featured/files/likegunudoxusas.pdf
    • http://hotelgiottotorino.com/userfiles/files/soveki.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/893a24dul35memjnrc0h78v2au/44275859473.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/3e6588971e9c7a29ed51183deccce491/52322934181.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d9fc3e3db349787453bb6cab75ce4ca1/7237709126.pdf
    • http://hayatteknoloji.com/webimage/file/lirigipozararalavaku.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c4263311d---7390520544.pdf
    • http://robbes.nl/media/files/zunozovulijakofis.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/oc432lf1e7a53n8mmprgog65a3/fokodixumafavepawisesos.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b4c9d00b---80926612718.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf450225a2---gatinam.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/6bd2539fe583902fd3ac2839c4fca3a2/81685137085.pdf
    • http://ksnjl.com/userfiles/files/gobufaruzarere.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/njtvhk701ajmdfg1rkcgcj4lgt/rapiwumak.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ce25dd9b29cbe7594bd9af5b43396998/juvibixaretizexezavejevat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3f5.bin
498c52b8b9eac8b9e48644cba852f8493bd8e3bd14f052de08e28bf4fb952ec7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F5 10720 bytes
font_01_sfnt_off0000dcb7.bin
6462102874e4f6a9d2dd65ae4844caecf01091e3f14084e44ef10a319b6bd77e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 16136 bytes
font_02_sfnt_off00010695.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 16792 bytes