Malicious PDF — malware analysis report

Static analysis result for SHA-256 f492faa6dd7c8cc3…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 08:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a54baf85a2ce2fd956a08e80919cce23 SHA-1: b57b9937d68d6db8632418a1bab316f7846e2406 SHA-256: f492faa6dd7c8cc31acb903c04667df954c2f2759a59df538935f16160ecbfaf
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links, many of which point to compromised WordPress sites or disposable hosting. These links likely serve as a link farm to redirect users to malicious content, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a182fd7a7f---bipowuzoxom.pdf In PDF document text
    • https://literie-depot.fr/UserFiles/file/sipibitif.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/werigekukoxejilaterepe.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/85724054838.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/jovoxakenuposakewo.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/sigejujalakozikug.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/fixoz.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109040359502762.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/joxiganeladepu.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/tevupidonika.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/masetezisoxak.pdfIn PDF document text
    • http://klpa.net/userData/board/file/nuligezefugemekanexep.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/15567174460.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/87255506210.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/5981c03231a272151a85c0ab59ffd160.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/zatipiv.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/fazonegigotanumaboli.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/91434075350.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/velesepezowo.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/2nj5orgo9bl7pdkkid993m9k78/62927850392.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139f656b4e45---rumanalikugulutadof.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/boxogegokulumidipemux.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/tewugixadozudipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=game+theory+solved+problems+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_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 18564 bytes
SHA-256: ac22acd838a43fe14b921c7807ebb6bdf302d8656ad9961f2771bdb42e298160
font_01_sfnt_off00010c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12439 10928 bytes
SHA-256: 094dfff44f0a3784a1e222a65d47931ba6df02f22f53726d459fdbddeac96b04

Open this report in the interactive analyzer, or submit your own file for analysis.