Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e82c1683820c39…

MALICIOUS

PDF

94.1 KB Created: 2021-07-26 01:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d0ddef734c74523e2ddfd135aa67194b SHA-1: 4e7c10d4a061d8b579ed9ba77091f18bb14fa9bd SHA-256: a7e82c1683820c399f00fefb8ebb77153abd4ccd4b7a0661c0f9fdc2e76f12b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the overall structure strongly suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://perfekttorun.pl/pliki/7780661445.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/33006117986.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabe108be6e---vesibelaxorilojugofo.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2c6091b9---86964752374.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e80165494b9---38201102959.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/vovakinefivagenigi.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/mupok.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ded425197---57173450398.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/232e5ccc9d4d4ba0ba497c545f440410/94757658582.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//zisabibafokofojifi.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/lixananiwidilojoviviwesam.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/34f05991537ef2fd7f94a95953aec2c5/gapevolimebuzejid.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc0f63e677---14135185698.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/pukilateginokonusav.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/bobisokofato.pdfIn PDF document text
    • https://avenue102.com/uploads/file/56621303660.pdfIn PDF document text
    • https://atl-50.com/files/file/43334852587.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6afb1e45ce---nasewifetidoj.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ae7f277a9310bd6137919e27efad6c1e/14510614080.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/71133872825.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/1266e8ba360702bfb0f2c611effbdc77/sitirimed.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/29925632685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+hack+in+standoff+2PDF 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_off00010e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9D 17048 bytes
SHA-256: b4acf5e51d6be64a5307565291bbe4b4528e0f81cf8de564c4f9ebbd98058d44
font_01_sfnt_off00013a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A94 10584 bytes
SHA-256: 32edbca260b603ea84a2d59ed2eb733848ad241c3eb2b5969a6c4247a9ca1ea6
font_02_sfnt_off000152cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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