Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a08309dfcd85018…

MALICIOUS

PDF

82.0 KB Created: 2021-06-28 10:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 046f336fd54e6257803a8a723bbf3b67 SHA-1: 4c4d1880572509b64f4850fb3b5883243827b0d4 SHA-256: 1a08309dfcd85018963d30d5efeb2beccf850c5fc3cc93ba950919ccd7a7c427
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, many of which host other PDF files. This structure is indicative of a phishing or malware distribution campaign, likely using spearphishing attachments as the initial vector. While no scripts were directly extracted, the PDF structure and URL patterns suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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 http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efff3dec80---81604887024.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba35dd48e5a---49032999724.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074d7a02c224---zutavonifapatasesategos.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160733b8a4dc98---medaluvilekazoximelowatap.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/xiwuxuvigagevubapab.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c67c3195b13---pesuxemavamilagodasefovat.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/f1630f439707d047a6f3dc6466881bc3/30019297763.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c184a1250---27053134548.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609afe36b8015---vifuzuvowol.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e41d1ced4---solavinikibogoniwipukib.pdf
    • http://navigator-nsk.ru/userfiles/file/78783096552.pdf
    • http://dentalcenterstudio.it/userfiles/files/pupozugozawugutipofareru.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b54963063---87812706003.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/601c2edd3e91042b9b00deccc9e74b47/zuravununagisifenukeni.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/552e109d1ed90071af5482c4e9425f7f/28423180498.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/db9cqh674c6lundbnskik7kme6/jilolokazorejanoworuni.pdf
    • http://aivieksteslaivas.lv/userfiles/file/1216816885.pdf
    • http://www.awakohchang.com/image/upload/File/ewulilegesuxumaravagis.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/dd6sp4hpbamt3lu64mh6nft8qc/mibulilaged.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/1eccbc530975afe73f33e1cbfca26303/kukiweradofolutixik.pdf
    • https://susta.vn/userfiles/file/54324345821.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/e3brh1cj312imbirlhi55a2lu4/45760669221.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be352cdb207---jijanavolamamudezulib.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c874032a8ae---juveduzonibebamux.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dirty+talking+mature+wives
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000debc.bin
09380a8d96980b34dacbdc0ba0eaca26ca099d2cd75904ff72319ff7bc003fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 16516 bytes
font_01_sfnt_off000109b0.bin
454f340555683fc09f228f99315c8b39a0a1bf1415164013204f979bfe40bd39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 10792 bytes
font_02_sfnt_off0001229e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1229E 16792 bytes

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