Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27eb225ab3ccabf…

MALICIOUS

PDF

71.7 KB Created: 2021-09-20 06:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 466b5b57659353374af6dade6ee47162 SHA-1: 723dcb67a1c0887d66b3a2322b3e6ee36b8a8b5c SHA-256: f27eb225ab3ccabf6e1025a40f99dc464e7345b793965b862b34158e4741132e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the PDF structure suggest an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://nomylo.ru/uplcv?utm_term=grow+old+with+you+wedding+song PDF link annotation
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161458bd4dfc2c---64984190554.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/fipirubibufadoxe.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/nokixugeje.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/deforinetido.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/rededojilubuva.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/vedik.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/kevaluwib.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/gizofeketoxakukalupak.pdfIn PDF document text
    • http://polipack.ru/content/file/jekazusuni.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16147b011be92b---tumivaxusorojoxiles.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/sanonoxigezapumefoban.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/20076840687.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/217bd7cf8a72e04b4593a41e40e65f48/41523322589.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/24115480850.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/riroxe.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/26983786168.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/trbbf1kjes2q7p71ljshde0ton/vikefabuxe.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9d6f2770---9618154983.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/fuverufoxoze.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/9103363897.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/gidiwupegibegakozo.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/65042199220.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/logibojidav.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/57801592642.pdfIn PDF document text
    • 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_off0000b849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB849 15860 bytes
SHA-256: cc4e09db52f4dcdc3479f3c8b710a1f5bfbfb950ff8c954682b999ecd2611bb9
font_01_sfnt_off0000e10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 10704 bytes
SHA-256: 8a203331c1b3386fd2ba6c11ca6846cad1657020aefc371807d4910e1f7e2ba8
font_02_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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