Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8d4927c1d935aa…

MALICIOUS

PDF

88.5 KB Created: 2021-09-07 10:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 882c6a001a5ee55ad000d156e426bac0 SHA-1: 4a50bd7d2df72495019c803ee80003c8a757c07b SHA-256: 7a8d4927c1d935aa0c48bc750a8da8c84fe774694b6640068486c089a770bbda
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and pointing to compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious. The embedded URLs suggest an attempt to redirect users to potentially malicious or phishing sites, likely as part of a broader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://baaningdoi.com/file_media/file_image/file/84848749879.pdf In PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/56456981089.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/luwuxipope.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/587554eef6f9788973088130268140a8/tosowemituxezo.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zonebam.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/nogaxizobarasina.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609cff4e983b9---vuxewetoba.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/torogekukowazowularopep.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/miwodu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080262f1e0b7---gemunowofadirekupo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9111e58703---12474199095.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/16428859533.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/35337029087.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/70539235394.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cf26b7df5---95925848386.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/3610767514.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/pp94vqstgqibo9j13flgvdec80/44936821315.pdfIn PDF document text
    • https://cape-electronics.com/media/file/70625116512.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/lixusisazuxe.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/68743130561.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/10544660092.pdfIn PDF document text
    • http://nature-revive.org/files/file/fifukodugumubezepotelu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tvpe72gdrmt3vfnsjoefkdt75c/gonajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pathophysiology+of+atherosclerosis+plaque+progression+pdfPDF 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_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 17692 bytes
SHA-256: 5215bc083a40998bd65586e4d036f6fec6ddc43bc91c830079d2b8776494609e
font_01_sfnt_off000121a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A2 11260 bytes
SHA-256: 82fb8766a6fa14db41d9c51794849d5e774b43b0386da8388ead3d396dc31195
font_02_sfnt_off00013b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1