Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25b51ca2973e35c…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 20:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7fe875ee3d7dda6bc0cd4d6395e29a54 SHA-1: 377747f51a50de01911cfdb5b87543e93c2bbe5e SHA-256: c25b51ca2973e35cf9be86673787f319b3df026042530d679cbb98b4a4e6d53d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host and distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440aa3751f9---kuwom.pdf In PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/tizuripipitup.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/dosobefobomazuretemep.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/35363479273.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/3243816389.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ed3uhmpgsqkcj6da3v6nocco52/50330149478.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/jodowitefu.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/lotoginepuweweketido.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/50211040568.pdfIn PDF document text
    • http://gespk.com/userfiles/file/70194040829.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/taxakuzi.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/tq2rql2bmnhb56g41qsu4l6gr7/todinugogijufefelarime.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091217453065.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/jomugapezi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f44fd72106---26993755913.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-9/20210909013855858775.pdfIn PDF document text
    • http://ewtch.com/upload/files/gexogom.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/37206276648.pdfIn PDF document text
    • https://slide-bearing.com/d/files/10308814842.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/sogubefej.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4b91bf98139b5295687c611e6b384590/kejidefukevuza.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/24407412915.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/59831119550.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/govabuj.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/didipifidefulowuvileligaj.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/pidawoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=super+smash+flash+2+download+for+androidPDF 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_off0000c33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33B 11044 bytes
SHA-256: 0d502656ec7ec9382e90192af646e6677bc10f99df89a9401086d304ad9cc13b
font_01_sfnt_off0000dcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCA 20024 bytes
SHA-256: 20e60584e27c7b4920d6b1b2441157dbfa8a32af298bf371b175468275891e6e
font_02_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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