Malicious PDF — malware analysis report

Static analysis result for SHA-256 8430843a318effae…

MALICIOUS

PDF

69.1 KB Created: 2021-09-30 16:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a21430ca1fc4d48416faa35b088c2f9c SHA-1: a778afd8f45cec2abd722f93e2a623271fe9d7df SHA-256: 8430843a318effaeee6a3a18cabef388ee55f154495fccdb5744d6239a0d2dc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely using a PDF as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/n3baca9tbkorgdiinkqjrref2e/pupuxodeg.pdf In PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/buliwuworajexufikozebu.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/pexuxanemupiboro.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/70424800693.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/58739986309.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/7a5e9feda7f0eb38c15f9b92df6e5691/jewoponebubuzifavokurag.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614db6d130c7d---posaledujivezakozemuwerov.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/89681827571.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/jovaduwamimazewim.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/50622628898.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/rukajazamevabuwuberojuw.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/92084339508.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/defomobuvuzurinodan.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/moxenokafoxikamubo.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/tupitugijen.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/43188442493.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/58863140852.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/gonipomuxiga.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368740e2b93---sapijejunitufivon.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/wemarabigevimuwamewavup.pdfIn PDF document text
    • http://unityproductions.com/upload/files/5979130518.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/jisomuxemitaral.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/60689518301.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/vogejomimos.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/40129734765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+go+sms+proPDF 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_off0000b1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C1 15088 bytes
SHA-256: 54b0154342e2dad95001ef7e9fd300c1b5c1bf82c63dbe9221f745a6e1ad4e5e
font_01_sfnt_off0000d79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 10500 bytes
SHA-256: 5370dee4bb51345a3c95afdab1c389b272ed63b63f02ff45f67913cbf48e5c2a

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