Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa641583477425ce…

MALICIOUS

PDF

74.9 KB Created: 2021-08-11 14:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a7a645b8b144cb38c571633f90fe55d3 SHA-1: 5d748a31631d1be23e8667c916ca24a432420e0c SHA-256: aa641583477425ce1abfadd9dc64536354301dad3c66cec2856b73560cc47d8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of a link farm is sufficient evidence of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/usq26pct0mann7h6hi7ec8vish/79636833130.pdf In PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/bizupuga.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/papujidelilexukaromu.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/96119098885.pdfIn PDF document text
    • http://zatacorp.com/upload/files/doxafobuzapixiriwi.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c569b7808c9---23168842173.pdfIn PDF document text
    • http://sooclose.eu/upload/File/80339556763.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b969975fd5a---61312587534.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082065802b61---vububoseraxofewoku.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088630af1e48---matenituzidenivurafuvi.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/xuxigokas.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/50cfd6a6a0d1bb149a57818bebb8a003/96367939064.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/75554311877.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/38226777578.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d272c74638---96974221717.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/d025e5ed0bcbe1ad516c15785e3ad6c5/jiposagegefigulapinonow.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/70269250496.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/fsujqvrh2v9gni5b4170p2b1to/41978024331.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/lanomekamube.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a020b5b8b---99663501234.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9cccb7a5a7---xuwulipo.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/padirokixawumasonejokigiv.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/sscfrl8oj0kh14mpnfuj7c3tpl/mozazipirosukonorepu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/1eb181168b1258301590926e794ae91d/jawukexemop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=neurolog%C3%ADa+pedi%C3%A1trica+fejerman+pdf+gratisPDF 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_off0000c270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC270 15236 bytes
SHA-256: 5be75a3c7ed022ca4660389b4395792cee7dc4c4d100486e7e67c8fed1363984
font_01_sfnt_off0000e856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE856 11412 bytes
SHA-256: c955c610f3d9665aa66a84d7987bd891fd84b54ed66a61f9fb7bf2e7794fb8e4
font_02_sfnt_off00010292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1