Malicious PDF — malware analysis report

Static analysis result for SHA-256 c234c27ae09da8bd…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 09:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b2ec5185c5a61a8035a8560a0bc55cbd SHA-1: 4bc4514d2ea1a82f80e4a160a6e1e9d28829c528 SHA-256: c234c27ae09da8bdd179a29ae0a19676525661171245e388684e427d14f43c6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 pointing to potentially compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, indicating the document is designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jkbprivateiti.com/userfiles/file/48244366726.pdf In PDF document text
    • https://mumegram.com/userfiles/file/21178729498.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/46qpgcllb2b9856svthc6pviab/sopuxuridofiwanerat.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/jopulodadolefo.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/kotaragilepikekov.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/mamokudiw.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/62396563870.pdfIn PDF document text
    • http://hueide.com/upload/files/91803127195.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/ralugonadurupekevepuvizeg.pdfIn PDF document text
    • http://retailcop.ca/files/98827061659.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/pokaburedetusivesazi.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4d5a7f07---41326030967.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/37080287219.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/detikodobapodik.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/ranalunumabinujivujufe.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/laxepavoju.pdfIn PDF document text
    • http://methese.com/upload/files/18028531751.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/zunesasuj.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8a574ab91d24b36ff0ad4d211e4d5c4/3762751389.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/0ep45k3umr6ufpqgp03kd2ggfb/65058696506.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/83295131564.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/laroroluju.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210902025319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=krunker+skid+scriptPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 18200 bytes
SHA-256: d2a253e6b52edd0a2ed88a72accc14404f7059e7975fda58ced7929885c59090
font_01_sfnt_off00010b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001233c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233C 10364 bytes
SHA-256: ff843edeba38e8183268a96346fe171509289e3af5fe9d7d34915bd6a72e7cf3

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