Malicious PDF — malware analysis report

Static analysis result for SHA-256 b399d3ecde054828…

MALICIOUS

PDF

95.3 KB Created: 2021-07-31 05:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16bdfa721e8848ff63d83f12949d53ab SHA-1: a2adcd396b36bd29057f6854df14186573f6cbc1 SHA-256: b399d3ecde054828aa214456ea4072a4be88a096b9ea5a360df90b9b7229c9d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect the user to phishing pages or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=how+to+unlock+dlc+characters+in+smash PDF link annotation
    • http://hydrem.ru/images/file/28105676968.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/ligufim.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/6306022a41dd090f835071933083d75d/15558534952.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-2/20210602223526836775.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/jutizirobejexew.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/85db725c906182451ace6ffd387b1df4/42083909691.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/53387f583b47c258a39c6d274c8c0f65/masovadolutozi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d83064b3e82d4d7da4de3eb9a0785962/12130946850.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/tobom.pdfIn PDF document text
    • http://armanetti.com/images/wimelegobatitexonuxu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607e829867b2e---85833889906.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/84337058676.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/tijerane.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/filawukenesetudugulukes.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607255f800032---4520387201.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/69123120233.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/nixepidebomafiwo.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/40541877764.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/78353540011.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59e871efda---pajodunabawikinipi.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/07-16-11-36-15-49.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/36553775084.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/22141339664.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 1776 bytes
SHA-256: 1092c062515a0e7c9fcf1de286437c915e481785be0ae9a2f6895ca910c008c6
font_01_sfnt_off00010f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001278a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278A 17632 bytes
SHA-256: 684129afa89ca41bd95b1499b536c09ea551cd6df9573c02e68c34f42e7ceb43
font_03_sfnt_off000155c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155C1 10904 bytes
SHA-256: 8f69918ee72149de1cb4fb31435e6f021e7c1800eb8b7143f7575a7f922ac0dc

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