Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ad7d3656fc0999…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 16:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc06d86d06124310b908c2fab5de7349 SHA-1: e87831391ed0459c168f97152aa730ba839944f9 SHA-256: 53ad7d3656fc0999b7a95b4082e87b57bf48084aa1985b6b1f21b2fc73362b30
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=animeflix+download+app PDF link annotation
    • http://fli.edu.mn/ckfinder/userfiles/files/zubabotodabozivada.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109040849051651.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/gemasotuboboti.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a162c17105e2af48c3edb89de64264e3/xajemibixu.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/81295556901.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/kigejirakano.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b000ee4bb8---15143598882.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/vivamob.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/48519003355.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/wudexamuxijopokafir.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a995834a79---61969455802.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/83657126218.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3d03bf709---kisorokesugo.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/dewapip.pdfIn PDF document text
    • http://xprchemical.com/upload/files/wegubedekuxitoligodigupu.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/xoritapanezaw.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/88506429066.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/4049998572.pdfIn PDF document text
    • https://seger.cz/userfiles/file/tivirimazasakedilipul.pdfIn PDF document text
    • https://izr.fr/files/64731010253.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/6609658582.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/besolezavoduvo.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cad4ce0859---levuwexuxunilotagabis.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/51352180584.pdfIn PDF document text
    • 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_off0000dbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE0 10460 bytes
SHA-256: bcbb5bbe1439ab1d7e7b10703d161691e40790fc555c560f1f141e166fc2f281
font_01_sfnt_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB7 18052 bytes
SHA-256: 32ef9be947999e11abbe576e65ef9d59f62b5ea5ae46646fedb4399ca71c7ea4