Malicious PDF — malware analysis report

Static analysis result for SHA-256 666843bc276830db…

MALICIOUS

PDF

86.9 KB Created: 2021-09-16 16:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f632a367b64c6c67b235028251ff2d08 SHA-1: 561f221954077ccece00e0bdb726a04b90083690 SHA-256: 666843bc276830dbaf223bedca52c70a5d59101f1ee06cd7e19c84eb0ed1496c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://irlanc.ru/uplcv?utm_term=how+to+unlock+blocked+iphone PDF link annotation
    • http://touristclub.in/userfiles/file/zazav.pdfIn PDF document text
    • https://stormester.no/files/file/61131325880.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/pusitiwuxuxazewos.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/31701855624.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/jepim.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/bakaz.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/70e0720faeeef7fb4aa02f19583947ec/vulonozawijiju.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/21479686208.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/78055094939.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/62700270534.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/78605995301.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/fejojak.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331d97484a4---75899698472.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/kewokid.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142eaba230d2---borudelimapozobidapejema.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/rapuvijidujafiwekula.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161334812253fb---75253516692.pdfIn PDF document text
    • http://potya.com/pamatarabowowoweb.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/vexixojumasitejijudelif.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/54135360915.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/rujugurujazesuvenubuxixu.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/19335053857.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/wefagasovegizelazojibolit.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/puloxefogigozel.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/98257734807.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210901164930.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_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 18296 bytes
SHA-256: 7c06fdf95db35df9248e572e9dcd8d6cd2b66d6b10749aec0450ee129b5b6aa3
font_02_sfnt_off000135e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E4 10588 bytes
SHA-256: 30741bc61dd521b39d71a17cf4da2ec826cd1d0fdef1803c61d61b46f181235a

Open this report in the interactive analyzer, or submit your own file for analysis.