Malicious PDF — malware analysis report

Static analysis result for SHA-256 708980af0f37a49e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 06:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 604ed63ede12e8f35058d1463830ad28 SHA-1: 941692a9c0b12d47a167a9f1c57acbb375df6b73 SHA-256: 708980af0f37a49e128b1e3f23db6b80b73c16a93c214fff6f724280d2cecbc0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF containing embedded JavaScript and a link farm pointing to compromised WordPress sites. The heuristics indicate it's designed to redirect users to phishing or malicious content, as evidenced by the numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' firings. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=instrument+supervisor+interview+questions+pdf PDF link annotation
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/9kmcop3u2a7knfqhikgb3n6avd/75097156310.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ap8q4e28r0purqe8hbclkj6une/kiwelu.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/wugibevapinumalovupeke.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/61272502234.pdfIn PDF document text
    • https://sankohomestay.com/userfiles/files/fudubavovefurumo.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202108301201024072.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/wudasupexexefidopale.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/83b2d8b45cfde3c0bedf92dc89a9b62d/9547110755.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/33426811119.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/wiwikerojatiwikunelizajiv.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/12695175591.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/85796144285.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/11440cb32c2867d0397177cbdbcb8331/zopukarugene.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/tezejilugeb.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/989a3f80e033a3dae7a98f4b2ba40d62/zogodudemaju.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/27876133278.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc9fa01a24---61460311853.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/dcbebb22c46954da1a1c4f836d29e225/2250399943.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/6477229322.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/15655333390.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5b97b2d6ec3ed2e5a412e5bd087d504c/88362346627.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dafde02854---82797264585.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/88257364569.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_off0000dec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 10800 bytes
SHA-256: 8cf6733a5fd61b3221ea82e350737856b747280f5009f529afdc06ce5ef084cb
font_02_sfnt_off00010f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F95 17128 bytes
SHA-256: b8b8b33e6aff7cb68ca67ffcbc53eb2d57e119a17f9e99f5ed91f1e86fe1d400

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