Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbde2abb955b66b8…

MALICIOUS

PDF

93.2 KB Created: 2021-07-13 19:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d869fbcb9d3821b005377604403d7513 SHA-1: 17e149593c2b0ea284e96b204a446e8e3c3bdd20 SHA-256: bbde2abb955b66b83d9fb6ee520a19f3db280a83e54a6e634eeafe10cd375655
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to numerous external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://industrialdevices.in/uploads/17434768111.pdf In PDF document text
    • https://bestwaynepaltrek.com/ckfinder/userfiles/files/87640669001.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/dotovobopegigimulazoz.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/6334036738.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/rusifonolowobisagipi.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/4361ceb96e1dbe91467b3a3265b33ec9/15589214122.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/7j5h8v0dga09f668g26spn2rd5/32531371479.pdfIn PDF document text
    • http://camonetinternational.com/files/file/xulubotusijumares.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/femekepel.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/38085335806.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/88618423964.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/9cm6sp8kljnqhj8a1vt382cnnt/nexow.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/41881789033.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/dcf6cdb307a431dbfa957236262b0674/makufevabotufilegumuw.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607216abbad21---99811260701.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/90118515816.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/79548378720.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cc11272448f924640de81152cd984390/sebajilaratodefel.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/jigabexonifuxexitiguziko.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4b59b56be---tajuzode.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b37c4d4fd02---68740240509.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/24284799423.pdfIn PDF document text
    • http://apvn.info/userfiles/file/tukekilenuletasofepeluku.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/59970224348.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/sokagikebefab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=why+do+plants+need+warmth+to+growPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 17240 bytes
SHA-256: 3187e4e5bb3460760b3bd76ccf4be119c8663c9672fe31be78c2bca65e478b8e
font_01_sfnt_off00011d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D37 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_02_sfnt_off00013411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13411 10940 bytes
SHA-256: fa8a345cb305e3a8d8cdbdb96aeb6c0772cd598454b5ec748f5eb79c47621f12
font_03_sfnt_off00014d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1