Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c984aab5b5cd48c…

MALICIOUS

PDF

73.6 KB Created: 2021-09-18 03:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ec9a8bb350b40e35366d8e2b1a9dd56 SHA-1: b54cd340de2bd1d942af7810443629153127f73a SHA-256: 0c984aab5b5cd48ccea685693553bb06350725007a4277eb9bf85822df5e255d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm its role as a malicious redirector.

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 https://pistant.ru/uplcv?utm_term=cars+1+full+movie+free+download PDF link annotation
    • http://www.klimavill.com/data/editorfile/98348471165.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/49730272649.pdfIn PDF document text
    • https://cape-electronics.com/media/file/xikurowosezovivezaki.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/muwenugusinowuvoraboni.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161312740ed78a---66951405905.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/22123748554.pdfIn PDF document text
    • https://satesayap.com/contents/files/manupakegimopozotol.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/losigipedamijale.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/53154445311.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138a881f30ca---37122129179.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614228cf9a690---fegoxuxiwomefaze.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109081951158548.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/balapebutukoxowulisadup.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/faxipib.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/rozobokolugedipav.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/6588921983.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/bapezorazafosolagider.pdfIn PDF document text
    • https://airbays.com/userfiles/file/72965366385.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/nogik.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/zosukoseluwe.pdfIn PDF document text
    • https://la-klamm.org/Files/files/53646908448.pdfIn PDF document text
    • http://plusdesignwebsite.com/userfiles/file/bulesemobakadegojetorow.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/37359602491.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/zatawinixarawazopawemek.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/72941920063.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_off0000bd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0C 16920 bytes
SHA-256: fd6e46a40e03049db55973bd81e3595394ccc9213bc4e188c06bd49b21f96157
font_01_sfnt_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 10752 bytes
SHA-256: 3b748f410604e25e904f1ca1b8d8615f0fc22a2a3a5d0660725fe1f4c50a9203