Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb94c2d43038f24…

MALICIOUS

PDF

77.0 KB Created: 2021-07-03 06:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a11fa35adc667678782b52d03d050a71 SHA-1: 459eecaacf9f12213e6f128246a0ca464397a6fb SHA-256: 8cb94c2d43038f242ba9a2b0a1e6b864d5e88acbec48f5e2a4bdd7bd4e4d2a55
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users to phishing or malware-hosting pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an effort to manipulate search engine results or track clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec3f45089a---87346177895.pdf In PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/qaegs4p95tqh0o7a9ij9j59foq/zudebodukesagaromofubugol.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/malirubakuvanifo.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/tvqatou5baf0dvd031pj8omo6q/rawek.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2jcpr27mouvur0i6j1vhr6eucm/lakalajivajefapabowebani.pdfIn PDF document text
    • https://mmszke.hu/files/file/15993868709.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/woxagulopunabu.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/22027074389.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/foselanusixidex.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609311de568a8---puzenagusi.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/zivufebofup.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/27336094929.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/81852984098.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b787cf541d2---tometajosukegivodak.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ce2f72041---96753844797.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/99803030129.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/67728919017.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/kumebi.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/pogalofasiwixa.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/kjmo6ie17crjqd4rs6j2jkjf11/63739877730.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073af3db5b66---juzaw.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/22693155247.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/fe5ee5edada0e2007812a848deb90cc4/91336242326.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/lojivakoramajofawis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=tyler+florence+berry+triflePDF 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_off0000cdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBD 10216 bytes
SHA-256: 6669e42c158c0396b04bd61f6b54caecfed59ece133e08c3c0b2bd2151d0bb58
font_01_sfnt_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 16252 bytes
SHA-256: 91f56fcee0736684066286f37fdd803a6030fb72e8ddd2317160078f048f3ec9