Malicious PDF — malware analysis report

Static analysis result for SHA-256 955b4f09d656d7cf…

MALICIOUS

PDF

84.6 KB Created: 2021-07-10 01:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 550df532733e8d808fb7b41e99868efb SHA-1: 190998dca5ff70bc46a3885423a35e4c627b7152 SHA-256: 955b4f09d656d7cf62877088bda82823b7b54d40f991a9913b1184631a673d21
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://marcobernini.it/userfiles/files/65628402883.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad6570e9b3---49819404483.pdf
    • http://dinskayarealty.ru/media/file/nibunuwilududajumipuz.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d918d723f35b8f25d44611ef814d7182/mewumel.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078a431342af---bopusidofodorilimekud.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0af91ff72---43329291315.pdf
    • https://starbox.fr/img/files/vuxadozalusokufekesuwo.pdf
    • https://thaiahpa.com/flash/files/jomuxexegamur.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffd9092b8e---3556158633.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/67d60f1cdee72187c9b4db0a008ed04b/47279088543.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070985b1c060---mepupereroserutuxoromulus.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/0plmqsj0s5i2cs1h6og6vfgtds/25055590357.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f06d18754d0987ac3164d17ebf1e9fdf/fedigopifutefumini.pdf
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/51405075271.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/8e8062e0101482845480000d8317e6d3/44518349587.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210623203957.pdf
    • http://dailymaytrogiang.com/userfiles/files/53190536844.pdf
    • http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/736768743.pdf
    • http://amoy-art.com/Upload/file/24059643088.pdf
    • http://thaoduocvn.com/userfiles/image/file/wukisorutujubarunovu.pdf
    • http://stringquartet.biz/web/images/fck/file/jixexuweru.pdf
    • http://timebymtm.com/upload/files/mewilozilu.pdf
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/zisikezebogigizuj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=navigation+meaning+in
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf2.bin
970ff0c72f94c54d0b03da6ff8a19b7be08a2721b7a817da7a43a169a96c4842
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 10180 bytes
font_01_sfnt_off000101c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 16792 bytes
font_02_sfnt_off000119d5.bin
090a5036a7d7c20788d6d32bf1f54d322b213bbb0c2614ff27afc6d92e9de29b
pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 16908 bytes