Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cd464d4593f9cb…

MALICIOUS

PDF

81.3 KB Created: 2021-08-20 10:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8ff2053819e61b26e9c252b31e80df28 SHA-1: 807ef79d5b4c0fedb3f36f90d675d32b55eaa922 SHA-256: 85cd464d4593f9cb622b304eb2a676ee1c223392faf0745ecad7aef10a3d5ac1
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://garglob.ru/uplcv?utm_term=wondershare+mobilego+license+key+free PDF link annotation
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/1af659b14b000605421b7a00d7e0935e/8532265050.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/74645479749.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160727641a76e9---nukirozezagakedop.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/bubabupexulefuwodawed.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210704184236.pdfIn PDF document text
    • https://ancoraeducacion.com/images/5856190510.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/7d8cb6f8285996bc2f737f93053f31e6/rudimepufudeworut.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/jugudezazudotad.pdfIn PDF document text
    • http://gysanya.com/upload/file/210816005537568248z58txm6wwp65.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/f7u3d5633l3g05mkqacqvsfuht/mejugovunogeki.pdfIn PDF document text
    • https://synersys.fr/contenu/file/mevajujujonewoninuwujow.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/resijagala.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/6819901287.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/futipeniraku.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/36817813227.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880432899e3---33182476485.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0748205f48---zusinefeledomazukuta.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160873d6f59ea0---98324939192.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/44iog5vliplckmme9a3un90s0v/lodumofuzikakaz.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/32934125002.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/54105b4bd6ed37d57c58055ae0a4bc9e/wufasi.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/62079067135.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2ca620c68b75fdd80370fd82366c6865/8530104630.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/88531548881.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_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 11164 bytes
SHA-256: cbeb7b0b3ce1c696ff1c592be4db8604f8bc8d2fab6fcfd902fa0168d3350c4a
font_01_sfnt_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 16944 bytes
SHA-256: 5f57ac21bfd375085c2180ef8385e070eb0d2e2003d60151cccd2a125096b4b8