Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9be5674c9ffd601…

MALICIOUS

PDF

95.8 KB Created: 2021-09-21 05:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4df02cf9b42b6a845d411c02df6c44ae SHA-1: 3c8580398be0be0a890ed584961838066aad8352 SHA-256: e9be5674c9ffd6012cd1aa991d59d03a6c79301836c72e44bcfd9728b61dd2fd
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16134b0ae9da47---misetefamerewedis.pdf In PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/xekedijaposeviw.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/bonabulekojimosej.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/zarudur.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/84422729480.pdfIn PDF document text
    • http://julianina.dk/upload/file/96277743688.pdfIn PDF document text
    • https://chineseclothingonline.com/File/85407791589.pdfIn PDF document text
    • https://bloc-immo.com/images/kogakizawu.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/rinasodetugirosile.pdfIn PDF document text
    • http://maksimetall.ru/files/tavabenazan.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/28828966097.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3ba6c9c106dc7d928083f298462e38fe/benawedixesaduxomiwijamid.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0494223c---41131181134.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/fivasefudipedidibak.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/21778962236.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/affe259dcc6aa5d43e4ddb91984fde64/kesikifojabunufobavoziv.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/87125521752.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/jatuzaposejudagagamekumek.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/33540697315.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/pofunig.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/bikulazam.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/65733126516.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/78099432789.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/selinopireriganunikox.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/wivufopogazewibidukokudex.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/48115221135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bubble+shooter+game+apkPDF 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_off00011385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9C 10888 bytes
SHA-256: 35f6db51065f5a7e08d19914c831b67ecfaee31947c76d012d4df5ad8c442f4f
font_02_sfnt_off000144b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B1 17224 bytes
SHA-256: da68f840a2e072bb80a9893d66a9b81739b1c59b659904b78aa737f2287a0dcd

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