Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f0b40dab0426f9…

MALICIOUS

PDF

72.0 KB Created: 2021-09-05 23:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf8fa1a3cc049b90ff19b7071f261750 SHA-1: 92eb92ea82b641d58741457b88ad73ee14164292 SHA-256: 62f0b40dab0426f9cfe708b321dfe785aa3d234ca2c99f4dff41bdebe7a00498
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites, which in turn host other PDFs. The primary purpose appears to be to lure users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9ef607e81dfd010c18b742e877c791cf/pazumigisijoragow.pdf In PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611736a158a8d---piwesote.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/joxuveg.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77fe30286b---98399764398.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/9e3ceb208b7bf74c4e70e889e8f6559a/pirowebatikesakuse.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/58006202581.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/86978344580.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad69ba6b85f---47844299579.pdfIn PDF document text
    • http://centronegozi.com/public/selisotomozapojiv.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d05194bdc54---xurutexitalepekivusu.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161270876e58a9---sowarebo.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/davufazig.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/rosufemorika.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/visirig.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/zusuvikegofapeparane.pdfIn PDF document text
    • https://maviet.vn/upload/files/15133024641.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b380fa8f869---38804033565.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812bd22869b---panetiwudevigovivof.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/dbf2e827f95c32b10123eab790484778/82777558997.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dbc89dc56---96535914874.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/66763474998.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baef3d20d7---65246367904.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/logotimakar.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/15234370179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=create+fillable+pdf+forms+acrobat+xiPDF 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_off0000b944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB944 15636 bytes
SHA-256: 5099bc9105952adf5cfd79ede55112d93f813f3d8658bbbb4a1ab4fe001a108c
font_01_sfnt_off0000e133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 10952 bytes
SHA-256: 69de4eadec98df4c9314a5fe88ccfeaa3af1a94c79eb7f194fbaabd15525fa7e

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