Malicious PDF — malware analysis report

Static analysis result for SHA-256 29043d37432ca6f4…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 11:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8eb5038bae3d0dd57930b193717c83b5 SHA-1: 76477891b52d078594108449344c810ef3a8fbc5 SHA-256: 29043d37432ca6f499ea2ae12f648665cf40b0828e126e215b6a4d211b68cdbe
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. Multiple heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to redirect users to malicious sites or download further malware. The ClamAV detection and ML classifier strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=palm+store+app+download+apk PDF link annotation
    • http://archifolder.com/userfiles/files/46706190982.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f044654fd7b794135fb6253bae73aa17/jekanaguwewogadaj.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/22880960072.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/92022320626.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/2932l0a5dkqrl7tjogimo87ml1/33477570034.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371f49ab2fd---xapujemuzibev.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/78449528838.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e5e848c0---fitux.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/povejimuja.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/77982444055.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/7726030741.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a7c3f2460---83572320028.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/41531898151.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/xijurewexozorejaker.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/repugilos.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/92892087577.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/gixosufareli.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/wexezikufuxibuzetepilumer.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/56171805883.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/roxoguderon.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/76596330882.pdfIn PDF document text
    • http://cycling-software.com/files/file/80411142950.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/xonanoniwagil.pdfIn PDF document text
    • http://giga.sk/storage/file/24391872352.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/50688682066.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_off0000d48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 17584 bytes
SHA-256: a437dda20dba0ba5ffb28555abad7cc6cfeb9924a877b488e7123b90c5a636c4
font_01_sfnt_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 10640 bytes
SHA-256: 39c9fb52b973933c1a52ee83e43eb906f40c23012d7f413f5a338afa41e6fdd4

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