Malicious PDF — malware analysis report

Static analysis result for SHA-256 b255f8f197e805f9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 00:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 89ce65bef813da8bd124a968dfe7ba7b SHA-1: 3242e83223a7d586cb2ef78cff65fdea27c585ea SHA-256: b255f8f197e805f9d74becf4d0c27379b8282c22a3502c0a22c6f016fd7af065
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple distinct hosts hosting PDF files via formcraft plugin uploads suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d81211a71b---52748652315.pdf In PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/dojaluxuzizirudokexonowog.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c363e7cd5---78296053039.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/33789556218.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9b8ea5c80d023b77f5bc957b205a2e4/14416765723.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/ratiz.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/lawulapamumupevi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca6e68976---96063199932.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/zonusewejuloregaveluxebo.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/saxuxowijuluwivuvo.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a4fba70de---wamixibaroteti.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7768442732d2535b3a8a8f948c2c756c/zokasebupomanuduse.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/najifepudexevararef.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160840fc391a06---92870110521.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ce6816cdbb444f9658de2a723ecf93ab/wizokexefaxumozeto.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6295b3325---85089454948.pdfIn PDF document text
    • http://fgosvo.ru/files/files/nosakawiguramomig.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608431f62a49f---novupuzamajuk.pdfIn PDF document text
    • http://vucert.vn/uploads/files/rujokepedelizifonulirot.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160efd4589e95f---seredanitojorika.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/a5d3825e50bce36e6558f2159a5a9d60/49701163723.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e330b9c36b9---basutagabituxezudipape.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611af81ec079f---potirejo.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/xidepujowewir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=white+house+fortificationsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000c264.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC264 18460 bytes
SHA-256: 59e5b7010f1977036d322013170dd1af83dff933c9504a3b7815a1d9dfc19569
font_01_sfnt_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 10480 bytes
SHA-256: 4dca0c4a818298f6881790c5075abb31844ddd264c72eef7c9a9f42f08733b4f
font_02_sfnt_off0000f6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F8 16072 bytes
SHA-256: 09ae630f3e5ecec394f160fd5aa77771c77d0cf254d2e38ceda90e7a913f6b7f
font_03_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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