Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81d0d86a5cccd36…

MALICIOUS

PDF

76.8 KB Created: 2021-09-08 03:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75b8b493c0ef9c1412305773f80379bb SHA-1: 7b9e86f78f484d03f54f42461df17f135a6d5506 SHA-256: d81d0d86a5cccd36d4bf98d1487d54a5e923be06be12714be2c0edc3ff0d2cb6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links to external resources, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to deliver a secondary payload. The presence of these links and the overall detection profile strongly indicate a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/21d2f48cf20694a7d654e45dbfb8a04a/kuwavigefegosafimipawelu.pdf In PDF document text
    • http://polymer-optix.de/userfiles/file/61292482791.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/80915878739.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf8203ce2---bojewezajivapex.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/d83k8i65mi1k47tpanslsvr3gm/56867423047.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/bazesemurumalegesemuj.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/68d9d4a377499038e7ff4214c9ea675c/80055976671.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/98c6c70342d05d6ada64020bcaee0a88/7167970940.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8d22fdb6---webusowunubapowerexavo.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1b6b636e0eb5511eb97e1dc15a868ca9/zipegalenobetowetunekusuf.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/bajidakipirofimufezoje.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/vs0a6csagafa6otcair4gfqm07/gonaxuzevidizosajojum.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/xepideb.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/ligiwaborijepefimab.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4152386344---pumupulajepadojebuxunesuk.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/mobevesez.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8g9gn10c39bflfpqll6ip3q104/divoxawivokowatuki.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/2009e3a3935e9103fbeb0d6c73d6c862/48465295915.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210427221134188.pdfIn PDF document text
    • http://tisuputih.com/contents/files/tatapog.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/munafolezun.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/74598256146.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/70097151352.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/simofumefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=powerful+prayer+book+pdfPDF 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_off0000c699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC699 10564 bytes
SHA-256: cf5ace5381ba355eae4ba5dc965140198900a11bfd5369af739af9cc3a25d5f9
font_01_sfnt_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 18052 bytes
SHA-256: ebd8ba5fdf86407c07f70a1ae21d2aca823b94fbca934fc5116d8080aa869afb
font_02_sfnt_off00010dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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