Malicious PDF — malware analysis report

Static analysis result for SHA-256 0522e83fb0b2efe2…

MALICIOUS

PDF

83.0 KB Created: 2021-08-23 09:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bf43537d5e8a87343353d8254e98dcc SHA-1: 6ab3550337644179f855ed097927f11fd67b3dcd SHA-256: 0522e83fb0b2efe23a6eb0fedcc33788b89ee2ff346a97b918e114f3739df4e4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The PDF structure and embedded links suggest an attempt to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/64567036220.pdf In PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/59cb8l8g1nvev0n2v5aek2kei0/finisa.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/kelava.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/rhu61sm7tv33a9onsi7aavnfg4/kuduxojiwafizunufusa.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/85632199088.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b98cbf0941---20323592664.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/77401885903.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/17663119365.pdfIn PDF document text
    • http://abpaluso.com/upload/file/diremovif.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/wadilulo.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/mimaguxop.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/16821174083.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb08a483c1---madumubepanovekozigowopi.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/taxepuwebag.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/628b8351ca445f3733ad6860c7d4c957/22500516132.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/lawalexaruzejitawamokewu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/k6g407711cpdu8n9rt9dvjl451/golem.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/lakomimuwitagabonuk.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608213c8a65b2---60737073665.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d499708fba---98135456264.pdfIn PDF document text
    • http://108homed.com/userfiles/files/78351143719.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d898d8e11d1---7444259058.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/lanijozisoposunajex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=grace+period+for+car+license+renewalPDF 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_off0000e0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 16776 bytes
SHA-256: 37cc62ac88e3fd67cb0af44fd675f5b4eae10015b01ea92e4d8160e95d652ad1
font_01_sfnt_off00010c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12460 10640 bytes
SHA-256: a8946bfe67dc0f1d74eaa6f4dd01eb8afc48fafaf016c997f38821abdb8089ea

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