Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd706830a88bcbb2…

MALICIOUS

PDF

89.4 KB Created: 2021-09-01 18:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0501caf986df7a019667e60147eb90f3 SHA-1: b749727fc5699648e9b425ee58ae7f3726ebf869 SHA-256: dd706830a88bcbb2f70bc55bd8d00cbfe724b843af30dac6208732aba136e96a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to exploit user interaction via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=gmat+aptitude+questions+and+answers+pdf PDF link annotation
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a0ba9932e1---noxupagirojakugupu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d74a759e---gexiw.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/susubife.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074094ddda77---xaxaba.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/womutilepigoteguluko.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c458e51bdfb---66775885155.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/gigigopojimewusazuf.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/bfd8adf8c6e5f09bc7bba31a0b473642/68277487266.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160de0778b2049---52055724976.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/90600233f2be28cc894bd5d057eeb56c/dipepodux.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd8678600a---51898062935.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/89211830578.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612e752a8edc6---22367492882.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/bezirekoga.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210608013141_MzUyMDU3NDQ3MDY=.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/bdb2e2cb68a41d2545c292c8b6e21d2b/28084163127.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/59951806247.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a78d349e952---bimuvipapisevizitir.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eccd3ea264---rikufudagupevesuwaj.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/lvip2ned44dluko0l1dhr7brrm/sevuzu.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/35b5403d1a6a04b7719888eeee9bddb5/zozunenamiwitupot.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/bc90870a336712a2642871b26ee7e283/81698318593.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/jexatefenikosixoxibupa.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/kixemejosezivakemurowezuz.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983354d5e7e---zosozuzuriginaku.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/36692471748.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/34849276100.pdfIn PDF document text
    • 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_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001098e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098E 10984 bytes
SHA-256: 64c56af5e1ed886b5de523e4fb5dd62269e7266ee43a5a854c9b7abf9c155371
font_02_sfnt_off000122e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E6 20612 bytes
SHA-256: 1db8049b9eda0e55ad95a04774334e15791b5824226a50041b4402fd51e39611

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