Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a684e6ae237e25…

MALICIOUS

PDF

89.1 KB Created: 2021-09-08 00:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 92e0e1237380724ed39e737bb6c574d3 SHA-1: 3312c305913abe2ef39c8cfee9aee4d5f2e9df6e SHA-256: 25a684e6ae237e2562de604809dc1b0b6e6ac815f05bc25288eef1502961c930
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ludbaegitim.com/calisma2/files/uploads/lulenagufixalib.pdf In PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/2g36fl93lu23rr6oc97elgpuhs/xusezosovovesewagikat.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/85211420082.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/c9dc560a6989907469725653009b5d11/ruxironiked.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a80e2cea59---5116034069.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609e177a4fa5e---gofuwasotapogerulugazopin.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/xetofixagodegofamom.pdfIn PDF document text
    • https://profm.hu/files/file/rugojemifanovalewapu.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8c515c797---jazogumagufepenete.pdfIn PDF document text
    • https://citytrafik.nu/images/file/76711717572.pdfIn PDF document text
    • https://cape-electronics.com/media/file/79839445360.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/e1289ab78e30035f8542d2046f4cab9a/woluxikesiditowewaweb.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd8089e386d401475c50b56a90728a35/zolosijefejivalu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a0c9c5b3a---89370074871.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/bazifuxumig.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1610709b35ce70---kuxag.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/nixesirot.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/88202239456.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/gadezixune.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb70f38c5---28860298301.pdfIn PDF document text
    • http://accronline.com/userfiles/file/soboti.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e66f1b59dc---76829263035.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/fef0037a9f1215875d19db6157782cc3/xokenirumi.pdfIn PDF document text
    • http://dejede.com/userfiles/file/vebawozenezomir.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a68ab4d0f03---67902527763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=requirement+specification+document+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_off0000f716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 17780 bytes
SHA-256: a432a327bd77b4a2df28ebdf5fd788545356848fd8d7a2897e3947a34e18fa58
font_01_sfnt_off000124e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF9 11028 bytes
SHA-256: bbe70162444a4fa5db5822cb6d7e44bbe8d28582bbc7f38c8796bc64be49585b