Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f5dae76017a3b0…

MALICIOUS

PDF

87.0 KB Created: 2021-08-01 20:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17f95e9fdcea2acc1d6549c73e613171 SHA-1: f4725fcb5907b0a917bf6aa50183e8a40d686cba SHA-256: 71f5dae76017a3b01c6a74dca22d35166b84b4831800fabfa527280e6df6249c
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, likely intended to trick users into downloading a secondary payload. The presence of a 'download button' lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hrmconsulting.biz/upload/files/vuretejawobasetese.pdf In PDF document text
    • http://southport1969.com/clients/861680/File/tubivagom.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/60sl6j7gsimv0gknl2a9plpsu9/jonol.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/radoduzebipala.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/481570f5e937d37d978fa8577578cdf1/vunob.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/fewimafevusizutojafolape.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/jrbk7l2sa51h5ucs0qb3i3q8n2/detawogoni.pdfIn PDF document text
    • https://sanidom.pl/img/file/67482620106.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad58611d6ae---wosozazokidetigovosal.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/fasikexoxaxegena.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/14801134656.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/34040aa7b3ec48b9b3eac1d4826763b6/zodawisoporenexewakizugev.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/0069e6819bc99d14e49a0ae0f7a95e4d/dagixisafezagewo.pdfIn PDF document text
    • http://medi-sen.com/files/files/22137136682.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/46261865431.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/tiserosudakusuvanalaxuro.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099831232bb5---daberivigoxuvavo.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/21848540704.pdfIn PDF document text
    • https://people11people.gr/uploads/File/26758731274.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/72737567419.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/91888197695.pdfIn PDF document text
    • https://khanikango.in/file/bitev.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/51800885132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=finding+nemo+2+tamil+dubbed+full+movie+downloadPDF 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_off0000f1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 16452 bytes
SHA-256: c4dbcb30f073c878d51e08a63009614c6369c0053125f9362efefbf875e8c396
font_02_sfnt_off0001345e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 10916 bytes
SHA-256: 286e41da2719529ba2ad83c088fd3b39bbfd44a6849e080b7e65856cc5cfd66a