Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba91070fd400044…

MALICIOUS

PDF

86.9 KB Created: 2021-07-07 15:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 20f41d742db53f62258cf221adea3c54 SHA-1: 37b1e2aa6b5331e3cdb1b0d3a8f1bd80fc85a0d1 SHA-256: 6ba91070fd400044ba845571b9eac04512321f8820b1c7748ad5a369dca6e10a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.asap-recruitment.net/upload/file/11136345878.pdf In PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/rupiteligad.pdfIn PDF document text
    • http://moffatcountyhighschool65.com/clients/878592/File/wamadokemamex.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/tibaronudobuwoxumofij.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/16742935910.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b022924a1dc---61016989533.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/32869451385.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce23834c0d---76171557181.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1073d69ca2---37558000877.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab550402043---14905928622.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/dipogisubipi.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/xofuziwowa.pdfIn PDF document text
    • https://soechi.net/userfiles/file/53693711342.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210510/file/vuronowowobasukubi.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/30187cd4e43c89cfdf4b50861b00c103/damelivenoduxisizelipej.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/munetasepemozoseko.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3cdefd9fa647f966b6e6caa8ee0f1beb/74394368031.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c2fdc01a---66121423570.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/gutivupemabuvuvili.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/zupaseli.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/29298142535.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1c29262d---kajosija.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c559b798fed34ffbb969b2cf77f0345b/dufupilakudizu.pdfIn PDF document text
    • http://chikatere.com/Upload/files/6180073370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+was+the+court+case+marbury+vs+madison+aboutPDF 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_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 17180 bytes
SHA-256: 65e455324d2401d9802ff15341fea4a93cd307448b5a201f65b2de75457fc742
font_01_sfnt_off00011c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C37 11088 bytes
SHA-256: 5def591b68d3fafa59176721b6888da290be2e29c1b2f322d19e33c670aa07f9
font_02_sfnt_off000135ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1