Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f98d7e537acc6d8…

MALICIOUS

PDF

81.9 KB Created: 2021-07-18 23:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d307e37dd07ab3b3bb13543e039b54ed SHA-1: a1ae9f0d812897487e078a9b841e025cbc9d5727 SHA-256: 1f98d7e537acc6d8007a7dcf1d47ac2ff52d3ece4341e6396c6ddc3892e59f99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://transpack-krumbach.de/_upload_bilder/_filemanager/file/pefoguxuzu.pdf
    • https://magyar-logyogyasz.hu/fileok/file/jilufevetoxaxi.pdf
    • http://villa-carlshorst.de/sites/default/files/file/makasibekapajuwudikoxak.pdf
    • http://adabaskimerkezi.com/upload/file/wujafozile.pdf
    • https://cafesca.mx/ckfinder/userfiles/files/27361510918.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae1190cff---40647962684.pdf
    • https://raiporjai.com/piceditor/file/woxulexijaw.pdf
    • http://hoacanh.net/luutru/files/78673332760.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/79e763705f32211290508a505ef8f6dd/lizemolivetesamadozal.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/fd7871d3d0b987de40f631f1cba45d0d/50285387671.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b7b9cc3d231eb3cd0c78de02714b0da7/85723460541.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cd203de05d0b9723746a42fc3034aedf/siboxob.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/e22e07d9e71dc0838444e974a7aad34b/runesaji.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/eiolm3e191ptn9l31g3cipn8ts/fivubukazerozozuderez.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf0b864f9---zugopijudimi.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/rudetajiritadag.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c2ck9cj5pvl5m0rr5in33gfsb2/jitudowuzifexedagi.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4aefd4035---72047360656.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608382779dee8---49782537841.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d05c2a2fc---nubemepukarojobago.pdf
    • http://china-zub.ru/userfiles/file/dibiz.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c20325d65b6---82389077042.pdf
    • http://gphs84.com/clients/866382/File/mekifalelutox.pdf
    • http://tradeweb.es/userfiles/file/nobigeme.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=real+estate+office+policy+manual+illinois
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5f.bin
003037e58a34db6c8686dfb43307db3c677b8b85746168fbfef825b5216e3a70
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 10800 bytes
font_01_sfnt_off0000f54e.bin
e3a6d80c2a579c140a4a489c4b3dfe077379d07e212691124eabb47c0c2a898a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 17184 bytes
font_02_sfnt_off00012227.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 16792 bytes