Malicious PDF — malware analysis report

Static analysis result for SHA-256 0893cbb293814fe3…

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 23:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 115f217c3adf53e722d5ab2870428139 SHA-1: 99ad258537c7c5c4a68c5fccadb936a5176973c4 SHA-256: 0893cbb293814fe39db26ef9a4406226238f25b3c95cca1cc37805a079ae5084
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' lure suggests an attempt to trick users into accessing these linked files. The primary attack pattern observed is the use of a link farm to distribute potentially malicious content or engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=snap+on+modis+scanner+manual PDF link annotation
    • http://xnucleus.com/members//member_images/files/texozama.pdfIn PDF document text
    • https://2acontractor.it/images/file/tagovedivaxexuwonajizu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160afba8e61bbd---58249162712.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/pivididejewemalaguxavuwes.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/71271880791.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd9cce0246---85577111488.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a109a0evf6csm0o285b47vlcu/11492760842.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e023c764814f166f7fceaf2dd773235e/16297669531.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/soraxikozeji.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/5e3134f7a250642f0881ac45f2f73f62/73874884429.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/27832257429.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ac679b3681---zesolowed.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/ketoxadovimusibusalar.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/36062698148.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d3590eb3---17662624107.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/3683866185.pdfIn PDF document text
    • https://noddy.nu/images/file/76873199375.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a9a2b0c75---jesazusapuxemosevujizojuv.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722b0f32186---duxuwakobakanibobenu.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/62bbe57f2db7b8ffb5e1348a0a2ad978/xuredox.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b2d8448f1---movujanimanonapif.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/74580264215.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3v5csalptg9jer1tdcuv0t152o/mepajato.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/ruviragugikiguv.pdfIn PDF document text
    • https://dacola.com/upload/files/70040452306.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_off0000e3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 18464 bytes
SHA-256: aaa049597ab503cb0b487b0c0a7e4efdf05a63d567e6dfb9ad603534542da090
font_01_sfnt_off00011361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11361 10752 bytes
SHA-256: 101dea8371993e59582e94fa59f066c85c535dca54196d5996194b9dbe6e2ff9
font_02_sfnt_off00012c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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