Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdcf90771532cd0…

MALICIOUS

PDF

165.7 KB Created: 2021-08-01 21:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30e10aa77a8a80d4c7571d9d53305599 SHA-1: 3903d9a8778cb9d46bb26e1e79b66843a687e6b3 SHA-256: fcdcf90771532cd04172dcf87631c6fd4ba0daebdfb28a88359732987471bef9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b868e82128a---17912543600.pdf In PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb2f1dad8---xavufab.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/18426299012.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b44f23d2b9b---13124552488.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/88318526946.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qgi1p048ej87isef1nasttekh2/12006018784.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/diwuziw.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d6fb4934b6906237158bb8733a602197/gefofufiparilesom.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/dodebukemenudilutenewodim.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/73800401294.pdfIn PDF document text
    • https://gangnampools.com/contents//files/mobojameneliwo.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/61178907306.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/kapovaxasibumezikufarij.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/35221990874.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a634975e572---fotowuwuxemo.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/psngld1qabmilj8vrkp04bkfj7/48780970315.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/sekabegoniwafewoxuxajizo.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/birovefuga.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/466a92d9615b43480d4452e5033f85ff/pixifujulagizitereju.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095e15bdb120---xisifoberiwazemuneminova.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0e29922031f59036e25d8c726525c1e5/57451756178.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vd3qe9ru3cjdh3nrt1j4sk7b89/denikukum.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/44063560488.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/diwoperevomubibonolakizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=weathering+with+you+google+drive+downloadPDF 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_off00022804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22804 18340 bytes
SHA-256: 97278e2a65bdf4ca3c40f17f6041bc2ce06943895614fc5d74a7e824ac6b7e86
font_01_sfnt_off000257fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x257FE 10720 bytes
SHA-256: 5b6d4ac485c8a2cfc62e507567dca587de8e7498bf7c81625eecff215f0074f4
font_02_sfnt_off00027069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1