Malicious PDF — malware analysis report

Static analysis result for SHA-256 664465cc6a71f6c3…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 07:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5692cc1490aecd4a68721eb53df9179b SHA-1: 3db6fcf8ecfda63cd1f04d5aed4a34e90f295ae2 SHA-256: 664465cc6a71f6c39f0049ffbea3f5a416db28ebea3908590f790d4498efd235
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to manipulate search engine results, likely to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=it+ain+t+me+it+ain+t+me PDF link annotation
    • http://naszemotyle.natura2000.pl/imgturysta/files/pivinimefabivukedevure.pdfIn PDF document text
    • https://miet.hu/kepek/19110041541.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/menagasuduzexoz.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/vidafa.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/mabibalawetimorazi.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/67534803873.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/88921471046.pdfIn PDF document text
    • http://alltechsro.cz/files/23506485080.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/nadikakuvobeburukolirez.pdfIn PDF document text
    • http://ahchala.com/img/file/85366583284.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/76602984425.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/kititegu.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/nofutisis.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/vonodakadapifok.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/wuvigejajotux.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/69417267271.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/jabumidorejivunedub.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/nakolozi.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/81267127570.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cba4692955---sejikidas.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/fejiwiborepunegeraniwi.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/em084jlp065oo290h29ivvmcnb/91870826586.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/8171949643.pdfIn PDF document text
    • http://ty-int.com/files/files/jadevowipalavavun.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eece614735---naxagezakid.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_off0000ccd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD9 9784 bytes
SHA-256: eee6218349b85a591a3d996800c18dc858c46d98b7e1f2b28a092ea0d46b70ae
font_01_sfnt_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 20340 bytes
SHA-256: 4c4455dfb7987bb56eef7c1f2968b4e40b511f3aa1bf9019443e50734172e763
font_02_sfnt_off00011844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1