Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcebb9fa75738a5…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 10:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b351a630a3606aa3b55d3b960e85a8f0 SHA-1: 166920ee60a3d4d0bc3a013f2210745a5528b390 SHA-256: cfcebb9fa75738a5d0a376aba6674f7c44710ab932a6bdf53fd4ef502503c8a9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or appear to be part of a link farm designed to manipulate search engine results. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://acecaalcoy.com/userfiles/file/52646042733.pdf
    • https://keluargamimpi2.com/contents//files/besajosudatad.pdf
    • https://hashtag.school/userfiles/file/rowijukarikodojonepi.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/84u628obsuk2kj82phbftrkv9a/12431975892.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9d51a0484---panosizabuvorufejafon.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/mhks79ujqvchh4v058ulqvsk4t/zovigabinekunojusota.pdf
    • http://dok-vo.ru/userfiles/file/lexegeripipovadudibatekab.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/08dcbcf82da01c8718ed76fd0fe798dc/39267687305.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/epctfl2hlod6ha3a3k0niqrj93/34172773825.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9d75b99fa7b6e91abd77990932696722/memagesumuzazez.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/997aeb89d92e6788ebc159687764e36d/tulovudagurutor.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8al0iaa432ej1jocsm8fgmaec3/kotetatiledilotulesaw.pdf
    • http://auxerretv.com/content/public/file/83928150720.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a94c78e1dc---sefebi.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/j4pa7p6est23deaoaq9392q6p5/miwifi.pdf
    • http://trimblehighalumni.com/clients/84492/File/sumazupoli.pdf
    • http://gyobel.itpublic/file/garidupudeluvora.pdf
    • http://ascensionchina.com/userfiles/file/54487835057.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/b3cd3105uckmblt81gqou2ft30/33266169675.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be0be9e4a82---rakojubiverazowepaxi.pdf
    • http://arqing.es/ckfinder/userfiles/files/wexexomimugimenadofup.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a7a7025e---wumowadomuratenun.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a028fdc527d---56796981006.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc714c4aa57---bedejiteken.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68353ba8a1---85290027168.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aef46d8c292---vejer.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8ba679a24---xatoga.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=large+pimple+on+nose
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec87.bin
845209471ca5975ac60ce55aa36c83181a225994325dcbcfba16d1b0ca7a77e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 17308 bytes
font_01_sfnt_off00011a09.bin
80ca1a4d13777d9140ff48e36e625ad1b55f761461d7139c1c85247a447f4ed3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A09 10456 bytes
font_02_sfnt_off000131a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131A9 16792 bytes

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