Malicious PDF — malware analysis report

Static analysis result for SHA-256 828116237cba83f8…

MALICIOUS

PDF

68.5 KB Created: 2021-09-28 15:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 517da986c26424e5db1c7f01bce32918 SHA-1: ab9640abc810a7ba5b9b226815e00031329c4aeb SHA-256: 828116237cba83f888529488855ca20ad8d918719c217552694aa0ac577976b6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple external URLs, some hosted on compromised CMS uploads, which is a common tactic for phishing or distributing further malware. The heuristic 'SE_QR_LURE' suggests the document may instruct users to scan a QR code, further indicating a social engineering attempt. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://farmaciafoglia.eu/userfiles/files/17737717193.pdf In PDF document text
    • https://cakkue.com/contents/files/votibagufopuxakux.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615218eee9a65---42432995817.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/68220307306.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/kekipunaj.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/rosixonawuwokesakudotata.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132f699650e5---fupomimu.pdfIn PDF document text
    • https://andana.us/files/files/23151384236.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/kawimew.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/69075732957.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/67627667362.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210920_3F00130E2020ACD9.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/91377102167.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/72916738203.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/31851778422.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa8f1153ac---tawulasuboni.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/50787987826.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/56967616135.pdfIn PDF document text
    • https://safetyhanoi.baohohoanglong.com/userfiles/file/72177918547.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/70212391038.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/5987951636.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/28459576685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+scan+qr+code+on+iphone+in+photosPDF 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_off0000ad9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD9B 15300 bytes
SHA-256: a016af98ab9c57e295a0c40a06ff816214642a777aa60277b225d82404e8d8cd
font_01_sfnt_off0000d3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 10788 bytes
SHA-256: 38cce32dbe8e35c819fc34b13711ba6cd65ab8ed0af73866a8f68b71eec62cfa

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