Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed4aa93baee3b35…

MALICIOUS

PDF

81.9 KB Created: 2021-07-07 07:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0244ac18a0ecad2ac6db4415e8a09fa1 SHA-1: 0df6b434017d27798a4b86807a9a45e683340697 SHA-256: 8ed4aa93baee3b35473ca94c7a2098ff91950ec87c89d5e9bd4ef271fc3b4c2e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple URLs hosted on compromised CMS platforms, specifically WordPress sites utilizing vulnerable plugins for file uploads. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/r55b6nmb7at9kbb8kekr4mnoe8/25564603468.pdf In PDF document text
    • http://datev.hu/ckfinder/userfiles/files/ralirojenowus.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/zomizodofusum.pdfIn PDF document text
    • https://majubesar.org/contents//files/28320319983.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608577f6b9b36---15831693156.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ab4467af7---73652826339.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c880015f8fa---7995813141.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf635da9447---43328969040.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/76098470239.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/77571492563.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf377ab810---96867363318.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085846fe4354---fexowamabufiworurow.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ccafe6cea35ba30f9b3969df5f070081/pudifogexelat.pdfIn PDF document text
    • https://ebooksweb.net/files/file/40633078440.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d4fb0417efeb3d053abe9a89963ae0b0/96389332908.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/af2c8a3326c5004b8066291f2a4b789b/velikoxogenamesax.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607db1b905674---15898156698.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/58564127809.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2c1503bae---87652317253.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/pukutube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=addition+with+regrouping+3+digitPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44A 10636 bytes
SHA-256: 30de2f79c90e51d03177932f1afa3746d9a3c66697c030f3c1e316c8e9cd88a9
font_01_sfnt_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 17056 bytes
SHA-256: 34b38d2bcb702e920ce7c6c81d6cd1c102caf58a2b422d36cfd087c7b1f38e04
font_02_sfnt_off000108b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 16784 bytes
SHA-256: f0c788f0ab8ab9e0a136d5dec5d044a3d2764d306176d37adc56d4debe18cb59
font_03_sfnt_off00012080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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