Malicious PDF — malware analysis report

Static analysis result for SHA-256 506f39f0a6c473aa…

MALICIOUS

PDF

98.5 KB Created: 2021-07-13 17:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5450cacc103988339c654900a444c2a9 SHA-1: 75ecf98c30e450852b54d788a3b663ef322e709d SHA-256: 506f39f0a6c473aaf350ffae3c3b03c59306052e7b07125e6f8f3fa330bec5a3
196 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to compromised WordPress sites or disposable domains, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs are designed to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://blueyee.com/upload/file/19195631287.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4l2b4na49p6lv1ohku6793fql6/pirinizivodatowezuj.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752a2f5ef85---34512325634.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/c6559a85a6c84c197efe765fbb9ba0ac/97418405553.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tjpraf5doffa4t408i98291ki3/27331080967.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9932bd5dd0b5864a316cb513e77fe988/lufenevuvozudape.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/jfd63ea23q288h58afeouahhba/rewobageximojazigiripu.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-1/20210501131511653553.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec5829c0d5---megopexizebulilabi.pdf
    • http://2021woods.com/clients/b/b0/b0e6999751250b7f6f06d89f33415bdd/File/logoduniragoxuf.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e313b509eeda1e074bbdf423a4c7de00/79130924077.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/3f543c1d31440a039f05de6725ba038d/femotizajamujesoviko.pdf
    • http://architettosbaffo.com/userfiles/files/35679341730.pdf
    • http://tunglamgarden.com/images/fck/file/87398732286.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8be2463b---vofupag.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b08c01eff55---ludiku.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/e437ffc69b02e640141a4a1edc8c1c7a/pawijetukefob.pdf
    • http://project-st.ru/userfiles/file/81882857847.pdf
    • https://mytekas.com/UserFiles/file/vididotivipibexaguvipen.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb79706542---xubuvawewugobisis.pdf
    • http://hzdsbg.com/uploadfile/1626098513.pdf
    • http://7tec.ru/userfiles/files/ruxulunodipozifupubalox.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082393eb1b0a---kagavo.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a840783d029---somuriniro.pdf
    • https://iuoshili.com/upload/users/files/32661265494.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/20133577594.pdf
    • http://skpizzasubs.com/uploads/files/81290231176.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=quotes+for+upset+girlfriend
    • 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_off00011f50.bin
55496be63a273a5c4eb36b1f451956b76dc016ae796b80da16b4662bee4dad21
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 17236 bytes
font_01_sfnt_off00014bbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBC 16792 bytes
font_02_sfnt_off000163d3.bin
bdffe798db0a5231eca078b3d632181d5c2a02e0f5f1a8ca0a947aa8bd488f1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x163D3 10672 bytes