Malicious PDF — malware analysis report

Static analysis result for SHA-256 1927e912ddb4c4ea…

MALICIOUS

PDF

170.2 KB Created: 2021-06-27 14:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ea9e8abfc9712b1b4c7c0ee4205faaf7 SHA-1: 71acae84d306e902aebc4e2cff38130451e5d62c SHA-256: 1927e912ddb4c4eae4fa422eab03dd56e2c3201a8d0ba2ca51367e88f1c180bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wastran.ru/uplcv?utm_term=effect+of+air+pollution+on+human+health+pdf PDF link annotation
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90167b0d0d---48031911236.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d3ebbe05f97e987980810fcce47b8fa0/lisoperakarufox.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/telolel.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7460ea40c3---jesulig.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/98720477200.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0482150001619846128.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/t4es1df4sh52smkl7av9oltj2o/41061315860.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8f5b63962882e8db3a4a7848d80ee41d/88340172567.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a29dc2d79---25381001017.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/cbbccf25ab3c3f5c234420dd75671a3e/86904137973.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j6ir6ep5uftjacv6pal54v31q2/52491368873.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf274ef7d2---robabej.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/81470039846.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8168ba017e---28318257897.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/esh81uc5iu6v1vv14fgsnso3d7/9840933032.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/32247206609.pdfIn PDF document text
    • http://akssert.com/userfiles/files/venitetavezifi.pdfIn PDF document text
    • http://nakatka.com/files/file/zuwipopixiratotabufado.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/mitabetixovegige.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0227cd3fb811c8133036d104e958bb18/bekovitopagulenon.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e46a22445---51635403097.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/kesipulatenofizadirivijuz.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/mutovikomukoxobovopido.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/kugajoriju.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/naxiwunuxojiw.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_off000236ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x236EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00024efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24EFE 20056 bytes
SHA-256: fc8888a08142338f9e9fae549f16f8e83537bc6316a6907a2b4a78acc2cbabe8
font_02_sfnt_off00028317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28317 10800 bytes
SHA-256: 280263d5294d50f45da4be9c05023ab237d4d59e74cf53168339efcec232e5b7

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