Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a569a6decfef63…

MALICIOUS

PDF

78.3 KB Created: 2021-07-03 02:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 255abb30c0194768da1f4174c7e7f8bd SHA-1: f2ecc6b040f64908cd47576363b2f17d4ecabbed SHA-256: c0a569a6decfef63a83b193d3cee0fea98e24eaa2fba30f6e0fba9c45ebebd8a
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous links pointing to compromised WordPress uploads and disposable hosting. The heuristic firings indicate it's designed as a link farm, likely to distribute malware or conduct phishing attacks. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=powervault+124t+manual
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160958f773600a---65484554505.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/ce80617f41cd9f519c4ecb7c18433c1e/wizexarelefi.pdf
    • http://vipnjl.com/userfiles/files/79176975880.pdf
    • http://memphiscentral1969.com/clients/865565/File/zekoviwonufit.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609841aa24141---xativo.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/qkq8hu773fogu8l7h9ek9349uj/84388890907.pdf
    • http://skomi.ru/img/files/file/82862764542.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/82f6f1cqm47ip1601i41h9nl8j/45523364056.pdf
    • http://boek.se/bilder_umeny/File/rawumu.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6c3tf6r82r2goraqslgcmggo41/87784184478.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/16764493dfc59fd59034f267f440ff18/20215639522.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0c61321d318e8f2b5d8cd372592d59c1/3934411387.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c830d71492791b3857363ad93434d5aa/misulojado.pdf
    • http://janandpoos.com/clients/872640/File/bikowopuraxelaxaje.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a463f86b---95841080980.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/b4adb765accf4053abecc4505f482ef1/23412500843.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/h6cj9thrcohmbbbv3i2a55nas6/wobuletepajeduxarusabubi.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b285cc0d88f---65729621371.pdf
    • https://arerp.kr/data/file///vojewafodijerepaxa.pdf
    • http://gtshotel.it/images/file/69888386022.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/486149e02a7412b51dc9ee158d53e33b/bupit.pdf
    • http://motoren-adachi.com/js/upload/files/86319515317.pdf
    • https://7gking.tw/upload/files/kuvuxi.pdf
    • http://irk-yoga.ru/upload/files/vamupujipitovatavijo.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_off0000d0f2.bin
7c48a5c708e1f407a4e7389c050ddef3a53b2237dae6d220552e3ba54a63c0cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F2 16756 bytes
font_01_sfnt_off0000fbc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 16792 bytes
font_02_sfnt_off000113d9.bin
23005e98454883f2f84c55f25dbed582935bbb13102bc331152b7eb2a49f0441
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 10512 bytes