Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a44ca1fc3761589…

MALICIOUS

PDF

158.7 KB Created: 2021-07-15 16:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9ea3cac8ecb12e9ec274a2bcbc71f501 SHA-1: 8fce5f274c1a340b41d1cce4ad9893f87505787b SHA-256: 4a44ca1fc3761589940d380f21cea7d459c21f4ee47d96d9e98476180730f00a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting. This suggests the document's primary purpose is to redirect users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a820e0836e7---zenitilivuri.pdf In PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715d735bdba---karegaduzizafupogifeg.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ac689e69---95765950823.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/90681007412.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608298258e3f9---dajavivudares.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/54012841130.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/gedorizo.pdfIn PDF document text
    • http://qca.ch/userfiles/file/pigeninosejexejadibo.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/2684034738.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e992b5232f---revifenibugazutenarolo.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/d6b45a6fdee03ebbe94f24088aaa1b19/30835484835.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609e98ccbd007---rivuvezelupaxolirinu.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/xuzuzafinop.pdfIn PDF document text
    • http://deauville.ru/files/file/limosujalawulilakujagif.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c221c84754561e78e8f478fae415594c/95094342158.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/89817161206.pdfIn PDF document text
    • http://licausi.it/userfiles/files/59403852611.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/18802240895.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/getitawopididifenokorurus.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/webito.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4ed31018d---zidisikofifuduvokukewakil.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/680a73e4a16e93d4d151c8c9c96d94f5/32525237678.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gt8al9fvt7g39loqft13hica73/wapege.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9d0d4849---xefanepexikifip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=anorexia+not+losing+weightPDF 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_off0002093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2093D 10556 bytes
SHA-256: be5b6b3b2098c38f3a3bf12de931b73d1b5176b528ad3be95c924930e94ebebd
font_01_sfnt_off0002215c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2215C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002396e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2396E 20672 bytes
SHA-256: 9ca9a38a24e1d7ad3f261e53c268c70b0d5c59319a8fb7cc33f604cf30f72d89

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