Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a767f59d101392b…

MALICIOUS

PDF

77.7 KB Created: 2021-09-16 12:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 038dff45fb08561f604dbecfcf1b3055 SHA-1: c80294038d1c3118fe833b53b7b2923ff2abf932 SHA-256: 7a767f59d101392b431e329958acddaea3a8919215a251e4bc8340d1ff3fd9c8
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://laborke.ru/uplcv?utm_term=how+to+send+location+on+android PDF link annotation
    • http://hanmih.com/userfiles/file/20210906193321.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133657bc8814---71576946088.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/xavepufaw.pdfIn PDF document text
    • https://tigaintan.com/contents/files/xowowugavepumigigijajoxev.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/69860220115.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/guganu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8891986ec78de39bdd80ddc397d2d478/fevoponijizofadisovepe.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ptnoavim7jqu7k498utgv9psi5/daziparunixiwoziluzaw.pdfIn PDF document text
    • https://hiroyoung.com/data/files/gibewikiz.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/4bf5d9c97cfe447bb3e6742769718eaa/puvutodewixutav.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/10325704910.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/55606536580.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/lapugegukofozupiwodog.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/mexalike.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d030c71c5322f38a6e1fa34b73d975ff/32426841347.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/53157901775.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/30537914988.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/12039993560.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/37645456183.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/99706157521.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/gumuditegawepapudamerovi.pdfIn PDF document text
    • http://aurora-c.jp/files/files/26246636280.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_off0000cf2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE746 10440 bytes
SHA-256: 7d394730adb4dd4392786202768d0e901e265271df1ca7095fdd7b5350d8b30c
font_02_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 16308 bytes
SHA-256: 5255c50e2e80f46372a4f14f5d33e8dfaf38869a30ec98c30cce4bc280120eca

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