Malicious PDF — malware analysis report

Static analysis result for SHA-256 678ec3ca450f16f5…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 18:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 091ddcf5badbc2ee0ec32789a83ed23a SHA-1: d8b05638a220dbd1e143d64cc3252bc96b77dc9a SHA-256: 678ec3ca450f16f530014adb252410a3d44f9ecf4db01daa2a8cbc0bde35f414
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing and trojan threat. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious files. The document body is heavily obfuscated, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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
  • 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://faradbox.pl/files/file/nabapiganiguxobajabul.pdf In PDF document text
    • https://drproperty.in/userfiles/file/tixamuzolivola.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d2839b43b---18549377013.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/99382532343.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/sedoragadigazew.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed269010a---remuborigevamirogozozu.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/terap.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/56439734367.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc02c23ac---ninenetedojabo.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/luduro.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/vinegovozugilov.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/kcc1uf9i4hdia97m9pdcbgd9ip/1510167847.pdfIn PDF document text
    • https://slotpt2.com/contents/files/juvobo.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/58014376137.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/koxerajuvanesaf.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091818211173499.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/tadofemewukamebirosunaka.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fcac66c45---40820379804.pdfIn PDF document text
    • http://sbkf.org/files/files/69329312953.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/90312499010.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/26861641714.pdfIn PDF document text
    • http://bdn10.cz/files/file/73995375265.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210917134737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=truck+simulator+2019+apk+downloadPDF 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_off0000e471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 18512 bytes
SHA-256: 9473ddb193fcc66438185092fa7eff1a501d0235bfc546fffda267b379868b95
font_01_sfnt_off00011479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11479 11248 bytes
SHA-256: c5ebd8c9bad3d8a56d797fc18c31554729116367319c19e6e1963d09327f8c0e
font_02_sfnt_off00012f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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