Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d8b0daed7a122e…

MALICIOUS

PDF

70.1 KB Created: 2021-09-20 22:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8085195b8238c5b8cb6538b3acd1dd81 SHA-1: 92de95130d1d96bb03ed200e078bfbb379be79d0 SHA-256: 06d8b0daed7a122eb0124a2cbc234010ce126f1e21474589b508a90949b8e244
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and flagged by an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous URLs, many hosted on compromised CMS platforms or disposable domains, indicates a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=how+to+set+location+changer+on+android PDF link annotation
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/12037051110.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/64231880641.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8857a43512abb4a1a71e0ac5d9ecf223/wedomupuxiz.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/dabaj.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/81119668006.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2730115ab---66295539764.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/41850873586.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/seneloditajivoketa.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/37457128386.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/79807957367.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e39c2298516613bf2b811a37beecb90b/nivezirizimaxagajeli.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/kuzuwi.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/zulokejurinodisibebukekas.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/aqvd18c8t797fra14rnsioeti5/gimulelapulutix.pdfIn PDF document text
    • http://jfe.hk/userfiles/42573520487.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/78392261653.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/88004990512.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/97388423634.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/24580874192.pdfIn PDF document text
    • https://masukpt2.com/contents/files/xulozanewofet.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/ropowinop.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/48333888693.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/22062241232.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///16074158222.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/labexofovivutudakesoreve.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_off0000b57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8E 14700 bytes
SHA-256: 928cbbd80cdff3f2699bab5237e5e3c528e3145b7c2c1f2ddd3227a67d91203a
font_02_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 10724 bytes
SHA-256: 00ea1ad010b1b7fce5269f185568fcf7d09182f20a3e5d8059fd4dbe8790ffe0

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