Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf77a2ebd59e1b5…

MALICIOUS

PDF

71.2 KB Created: 2021-09-29 03:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8d7b34e09ac884d798f1cc02cf650ea4 SHA-1: 196343443fd5eb07479aec77fe76951d56a3bd7b SHA-256: fcf77a2ebd59e1b50db3bc92b2af12d0b6048a6eeb4988dbcb81a9070c24b7c7
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130708a1bfb2---59942539713.pdf In PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/60067000883.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/tekexulodibuje.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/jamaxem.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/45636644926.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0a2931297---96421509498.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109060605026693.pdfIn PDF document text
    • https://bolahijau.com/contents/files/peziwedezuvux.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/22902129624.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/52967827775.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/59398832495.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/dorokef.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/32664075616.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/39765841074.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/loveru.pdfIn PDF document text
    • http://unsersohn.ch/images/file/dobilarotodi.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/dixisozofodisopedogovor.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16144c87b540ba---39897830705.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090620253793.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/75528406481.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/19914518225.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2038a6ac8---59815533669.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/boxefugigibibofulodonuwi.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/6tmdp86etrc430cl24979s98ig/8952496268.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/20717200464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+play+android+games+on+chromebook+with+keyboardPDF 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_off0000b303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1A 11384 bytes
SHA-256: cd354cebe5d99a9871f41966fb2fd62405d3ed4e87f52a4f0ec78b2700e514ac
font_02_sfnt_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 16912 bytes
SHA-256: a69b0b9da5447d1860bce222b7306143b79ee95e3876bd4e3966099d01fded2e