Malicious PDF — malware analysis report

Static analysis result for SHA-256 590c52c72d955aba…

MALICIOUS

PDF

120.2 KB Created: 2021-08-10 12:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ade241b574bb87be29794f7009a194dc SHA-1: a5ee65d1163bacb7e858aac38528d43293b49900 SHA-256: 590c52c72d955abaaf621ae831cfc439ab85648cc0cdafa09eb1ebe8a801be52
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to deliver a malicious payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass initial security scans. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9823

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=definicion+de+literatura+pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/kctngeibilv6e47d7stk0rj1qc/33760085408.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098376fa7ff1---96823294972.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3a903fb1---xabadimejusebeketatojiw.pdf
    • https://rivaflo-south.in/userfiles/files/69650990874.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/dba194ae753eb6d5d77a79ddeadd2123/kovigofanojamot.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6f4c47364---tutujeratakexosojip.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/c5ik76avf39v1f44t7eirbkcm3/bidiwururekimepiladev.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/fec9466c199a4f8e724ef147ffaac54b/ropaxakepolageduba.pdf
    • http://ipsgroupjjn.org/userfiles/file/bapisovawifininuxu.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc94755055f---85878538087.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1a54104964460c8e616b7352170545b4/sogatawoxekomamokuzite.pdf
    • http://biblioteka-belzec.pl/upload/files/vitixidimod.pdf
    • https://pjkconstruction.ca/images/file/70726720860.pdf
    • http://sintellect.ru/Repository/file/lamumivezirosijalazimuxep.pdf
    • http://polishingmarblefloor.it/userfiles/files/turatazag.pdf
    • https://alamansyria.com/userfiles/file/15950880754.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2e5295fbc8e7757a2d998c9c4af16b51/zivunejigerosabasigas.pdf
    • http://sirmamedia.com/ckfinder/userfiles/files/tawevipa.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102be36ca782---xavabe.pdf
    • https://medtek.vn/storage/file/ruxigezuwevenog.pdf
    • https://balaji-technology.com/userfiles/file/44377820008.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/72889463399.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/or3cqmo3kgjeuca1urfs1ksbc5iqa3ai/rofagejuw.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/58989105657.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/nnh7pbtn6cocqiask5en9pevk6/22328219427.pdf
    • http://gold-carsales.com/js/upload/files/fatuvodo.pdf
    • http://web68s.com/upload/files/58478645908.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f87.bin
abd9bfae097943339c60877b01a60fd72b04bfd970052f81c62d3213b162174a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F87 20708 bytes
font_01_sfnt_off000193ef.bin
180162937c32a19b1f4671c68a1ed30d599927577d5ab12eedf6a9fc0d77a7fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x193EF 10548 bytes
font_02_sfnt_off0001ac09.bin
ac2a72c25553b33e62c614857c4194aedf727eafdbf7409d00c908857ebcfa90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC09 3060 bytes
font_03_sfnt_off0001b885.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B885 16792 bytes

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