Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c79059d4a63bf17…

MALICIOUS

PDF

91.9 KB Created: 2021-09-07 21:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 97d11c72d5b42557f699b85f6dc260b6 SHA-1: fd787e385edbf8a6016df8e35d87d34ac50dbe9b SHA-256: 3c79059d4a63bf17cf52b45805099fbc744d692526dcd1661b7cfd80fe889e20
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of urgency language further supports a phishing or social engineering pretext. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://serviceservice.eu/userfiles/file/11729157965.pdf In PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/34e2fcf582190d528bed8a18d98934ab/vidazofogisifajepe.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/69410656933.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/guq1a8in2ve7fumss2f10admer/14831116645.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//68678012210.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/kejob.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/3084753393.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f620d27fee---38125912204.pdfIn PDF document text
    • http://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/84305411979.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e59390e98ae---25586107460.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/60550383596.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/48123913131.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/fubexeraliwunegizopu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610e6e7a0ee68---jizegawekivujuponadasoj.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/4334789822.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/nixugaledodumak.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/kilufi.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/48008803976.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/tixinoxukofipoge.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/wixukekibafidofulexis.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88e2b3a1a---5992746114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=french+to+english+lessons+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 10712 bytes
SHA-256: 101357f1ebcbc8983f28b6d38f2e4c8bdc977bb95487a77a1a5cce3fd7f32cb3
font_01_sfnt_off0001150e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D20 20524 bytes
SHA-256: f7dbceea04b0520ea3ba74850be6e300ee2916ffe8045593de7ca58be7c7652b

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