Malicious PDF — malware analysis report

Static analysis result for SHA-256 35dd1ef53baf8cb2…

MALICIOUS

PDF

87.0 KB Created: 2021-08-31 12:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35979881fe55022babd3cc4de8ee3e51 SHA-1: b26dab69b78cfb05264c0fa5083a1dd29d9fde2c SHA-256: 35dd1ef53baf8cb24be1bbf5c001bbd6dbfd05ffc7653d161097260d7805fd52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to facilitate phishing attacks or further malware distribution. The presence of multiple external URIs and link farm heuristics strongly suggests this is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88e78cfda---wedusitesaw.pdf In PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/14/23283379846.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc9e18334---27350203714.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/toreme.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/50242621107.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/66203498052.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/4cb01971bd487f066500da724aeda25c/82509460060.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d1edd7dcf5203d0132b552ec838b7f3e/95888287811.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/5a8c78c2ebd5b90c17b21dcf219bee25/zikupovaviwe.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/lepawaduzekutemorum.pdfIn PDF document text
    • http://btfa.tw/upload/files/widejoritireribo.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/70766355561.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/q6731d11n22nemns2o5nd5ah0c/84197954405.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/57388631014.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/39168673526.pdfIn PDF document text
    • https://grancom.by/upload/docs/76392160707.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/rezulofat.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2b5a0c711e74cdf23f4d5d2b2db02341/67228799225.pdfIn PDF document text
    • http://sun-tes.ru/files/file/32497711406.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/rolupulerodonixazikezuros.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/falibunobitex.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/9237338388.pdfIn PDF document text
    • http://hodori247.com/uploads/files/26120041293.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/goteg.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/93073205422.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ae768e7d5---64010313073.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/selijigil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=smoke+detector+chirping+every+30+secondsPDF 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_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 11392 bytes
SHA-256: 85025c2a989b22021011ddbc3b16372e7df9b14859743e2d26b0cfcd73e878a7
font_02_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 17304 bytes
SHA-256: d8fb34334eddfd2de1b3ae61d9f3064725e940a7976ae613c8d01bd7b9382015

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