Malicious PDF — malware analysis report

Static analysis result for SHA-256 848255a3ca23b995…

MALICIOUS

PDF

100.5 KB Created: 2021-09-07 23:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb4c8b108640733090c2be1c6556c76e SHA-1: f6875b3f6904638445047600003da690467be9cb SHA-256: 848255a3ca23b99571fef93553994d1feb4fcebecbcd1ea57c1b84079e636352
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a payment redirection lure. It contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954b165a239---zaguzetomax.pdf In PDF document text
    • https://camgloberealtor.com/userfiles/file/54494747900.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/34256415130.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c2c3b22f1f30a4e00d0e424a224d192b/ponad.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/88271021174.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/28318431170.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/30765728194.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733a1bb2a21---xabur.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fbf95e5e33---54323019849.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/pcuoo2d7t1uqc3229bhu0nidbs/89149291645.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a531986dc2d---92311615140.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/g91q3k48kut3dqer8686up8iu6/92501472581.pdfIn PDF document text
    • http://meta-min.com/files/bulakowo.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/abb4e032e5a31a81ace66c94a8571f8f/1359393853.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/69945668800.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/86428053787.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///mupaxepukawat.pdfIn PDF document text
    • http://charontrade.hu/data/file/sunifawimalomenobozile.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608406eadc02b---91854748838.pdfIn PDF document text
    • http://caramelitos.sk/files/1856360454.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/68711497709.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/wolonilin.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d12f43613---vimugetazilujapiku.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/5ba77f3daad989882e04e5df8f79700a/vixuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+fill+out+a+pdf+email+on+iphonePDF link annotation
    • 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_off0001224f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224F 18764 bytes
SHA-256: 49502e12e1c67c25988fc17d4f2dce993f28830d8ce1048dcd73391b1c2adfce
font_01_sfnt_off000153fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153FA 10672 bytes
SHA-256: 577dd1a9f96ef5f5545f6f267310d05387861d5d85577a4949f5315496e5874a
font_02_sfnt_off00016c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1