Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e2498cd078b718…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 18:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb123ba86a4db07ba1063752335b923a SHA-1: cca070595072d528d59ebfa94dad3a75d3292210 SHA-256: 49e2498cd078b718d59c614752a4cb84637952b3af36e32aefd07555b903b6fb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress sites, and one specific URL impersonates Apple to lure users. The document's structure suggests it's a link farm designed to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://philabc.ru/uplcv?utm_term=stoichiometry+pdf+answers.
  • 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://philabc.ru/uplcv?utm_term=stoichiometry+pdf+answers PDF link annotation
    • http://kolasinprevoz.rs/slike/files/91241301657.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afc48fbd0bd---22739966197.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/664c3917e7f1b315f73f16bae7beebce/gapokone.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/lef1dounucmgrqmm1br5nbnkmr/bozelitapijov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff62a0187---lawogetakakagefarew.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/93282921107.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/ruwupajapiw.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607186168a9ec---xagefugosujiba.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/kugavamakamunugaxerubib.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3ffd50dd9---remazaximaroripatutitadaf.pdfIn PDF document text
    • http://canvangdientu.com/images/file/49331153455.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/resupevi.pdfIn PDF document text
    • http://houselandia.ru/files/74099622868.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/19025233183.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/12137959093.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0449270426---fowolakirosaza.pdfIn PDF document text
    • http://deauville.ru/files/file/mopirerubixomuvazes.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210806_120104.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/d276c22fb8e88ff6541ffb0d8ee1cd24/44632751654.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4efd31a59---farusozuvosomeb.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160989ded0fc64---75482861947.pdfIn PDF document text
    • https://cncunse.com/d/files/dadikanolegegus.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_off0000cb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 11112 bytes
SHA-256: 953216fe262130debb4cd1efd77667561dca9699eb865f8bb275fc861ab11ecc
font_01_sfnt_off0000e507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE507 17780 bytes
SHA-256: dd514cb9bf515fc0017f09aefb8feb5aeb6420f20a7112382e1e2dbaf774f419
font_02_sfnt_off00011388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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