Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56dd12b8aba19d9…

MALICIOUS

PDF

86.9 KB Created: 2021-07-04 14:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f09bea97282aa4a738a49a27029b5a7f SHA-1: c08535ac76ba0932edb713d2788e0c64cf1eb01c SHA-256: f56dd12b8aba19d9d8142062c8e586310ec8612e3a4f26357aea44e7644046a1
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The presence of multiple links to compromised WordPress upload directories and a 'download button' lure suggests an attempt to trick the user into downloading a secondary payload. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an exploitation attempt, likely involving embedded JavaScript or a similar client-side exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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 http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073ccbf416b5---13609559458.pdf In PDF document text
    • http://sxhk365.com/uploads/file///mizovafe.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1666cd5dd---97502503428.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876e7fb9ba8---kominofo.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/nokes.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/i8t1596e9ig3ebheejdc547576/wusexo.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/20649862385.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e59c34695---nalelefedujuwinu.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768ae25dd3c---46673778506.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/javetafujigowuzerugipudut.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9efc5c449c---ribukamemerutojemobugidu.pdfIn PDF document text
    • http://promador.pl/userfiles/file/42363020575.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607840ee266c8---97084895087.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/paxelax.pdfIn PDF document text
    • http://rentaruedas.com/files/others/84554547474.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/af708672576a8f397086e95c1bcfb750/zoporifojasifokevomekadeg.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf1332d167---gimolesakukugoxajil.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/bbf66682baf4490169d3be3904c059c4/pudesuguxira.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074094b67bb9---najutagojegeveles.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/juvogewitijolakijudax.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abd37d65327---maxegekivewifuzebafipo.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160700fe25c977---61666545527.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/wapemeteme.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/68blnqstn6p6fgtk3lg29qhjm4/menawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cut+the+page+in+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 17804 bytes
SHA-256: 879039af7ccd227275d52734fd1e708b71a7c085265d83b71c7ae5ef4c38402b
font_01_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E7 10476 bytes
SHA-256: 5ed85c6365c76fa80ede4d417ebd69db487a897f94877d787168f259e2721f04

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