Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8acd35cdf030dfb…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 20:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 85069cd323c74c20cb6c525756896e1a SHA-1: 3ec3273cebcf2f94b15a40a578a1aded7b9581e2 SHA-256: a8acd35cdf030dfb1af787c880eeecb43aeb5a2e4aee244bfda017dd094da783
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, suggesting an attempt to deliver a malicious payload. The presence of a 'download button' heuristic further supports a phishing or social engineering attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://allytemp.ru/uplcv?utm_term=windows+7+iso+key PDF link annotation
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a0878fb4c---31494692070.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/53782946104.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/wupadaxolosuv.pdfIn PDF document text
    • http://compsult.net/userfiles/file/sexufatipal.pdfIn PDF document text
    • http://halmar.info/userfiles/file/31184587716.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398cf408473---serojefaxijex.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/32335uvtsre1b2bf7dgu63s652/41402627971.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/zuxezepadukep.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/13988200102.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/8628013158.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/zifap.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/sazozotemizoduvifeje.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337b5f427be---seruwekemumu.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/ninenetopu.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/pozipifawumuselafojasitaj.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/48304456957.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/xawimenizuzulexupozeviga.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/wedutabadada.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/defobojuvinowegonitunoso.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/17195232066.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423fd40b6ed---pepilatemasa.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/pevagixoxi.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/60660650784.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_off0000d2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D0 17260 bytes
SHA-256: 08a8641aefa32b56a58d152a22e439c4a0639955aa181c2c4926256448ece9df
font_01_sfnt_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 10168 bytes
SHA-256: 47ddc1ad5a72ea90d9ab76bb4fe1dc155f8a7344b414158b9fd1ae1cb43be23f
font_02_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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