Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de1f1d374cb81f6…

MALICIOUS

PDF

87.5 KB Created: 2021-07-17 16:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3b3181ec616064b32e4d398ed4fdc4fc SHA-1: 3859a2f682de5450e13bb29542e9bfbf28f3b6aa SHA-256: 1de1f1d374cb81f6d38c3d21650d30fdaab032538a10c782940cee2edaf9bd97
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to download further malicious content. The presence of a visual download button further supports a deceptive user-interaction lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe7064d471---buxuxumivoji.pdf In PDF document text
    • https://beaszemin.com/files/77173859141.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/97511097221.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/71639697880.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba08b813dc5---88890875703.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/89ad569a4fe21b3fe7adc106a1d7fa47/debumewaxijenagog.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/ripamokakumesewivosagil.pdfIn PDF document text
    • http://funperm.ru/content/file/99020532701.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/50794164035.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a54bed9bc36---xuzetimemi.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/mapudino.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/wofozozuxu.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/79250219676.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/29713296317.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/jakitavagotono.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/52bf94b9087d6bf6df57d5a3fa89ed67/jawaxezofopitowane.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/lafewibadejokoxebinufo.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096bcd475621---koraxozij.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/xefepir.pdfIn PDF document text
    • http://malifer.hu/upload/file/gukejetex.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/bd2f2539b6c1d49b13e3c362bc42a498/4547903541.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/77769655481.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f5172903---vafupepofapuxokewotatubu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160982f489a641---xejujubibifenibuzaperume.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/penik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=important+questions+for+class+10+science+2021+board+exam+state+boardPDF 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_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 11516 bytes
SHA-256: ee08d96b8bf8d759e4784882185ea26daff9e9f9fae1edd8e258281e0a3684ca
font_01_sfnt_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 17900 bytes
SHA-256: e3a12f25d1f1587c6844738877977a242e8faaed7505e597d5f5163fbea9c026
font_02_sfnt_off000137bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1