Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a213db4c219c5ef…

MALICIOUS

PDF

70.9 KB Created: 2021-09-05 12:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d3410fc35d1cc9754d0d272678e0f039 SHA-1: 7bbecc59e4e967e55ba5c81a626cb5da24d8f4ed SHA-256: 0a213db4c219c5efbcde128e58d4f49960f0bec05594c5ea0324f80a5994910a
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness. The primary goal appears to be directing users to download further malicious content from these URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 5

  • 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://files.ibiza-ferien.de/file/60048324285.pdf In PDF document text
    • http://mtntoproyalshihtzus.com/clients/4/42/42f4769cb4f2467af64fea76c5682520/File/48944625551.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1cbf138ce---jegutobevewuxotagelo.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/fusawub.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/jalimolewumivewakojeg.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/futefojomememutonu.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/52268944015.pdfIn PDF document text
    • http://bscartridge.com/pic/42325878223.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6cc246bc99b2bc6e368d9eaf582b3741/390913343.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/ritezifikuluredugosowe.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d947dcab---25677279651.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dea20f88b01---xavebofezukafiwatonuv.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/mozixenuwewalawapezix.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988284c505e---movunomadojewu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982ecb3cfb1---riburujireno.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/98629569428.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/44c91b9ce214c13fc46eb326460574d6/92103574828.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/dibopanurumonoro.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/p28fs33cqejh8dfqf595otq0ng/78091453163.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/tireraribe.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae1060d196---vifajorebelis.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/81514724723.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/lijomovinofarenagejabon.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/bupodusajuvuvigudutapupom.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/fofutirodigil.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608979754daa5---22559163000.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16087827ade25e---jaxuzajubidokazogit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=types+of+heat+treatment+process+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88D 10824 bytes
SHA-256: 845bb4e70e468b7b4ad882e34d63b51ba567d13098f87bd577f9c14e0058029d
font_01_sfnt_off0000d168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 14676 bytes
SHA-256: 43741c0b521f7b63bc119520fd831783a59edccff0c87c27977be369e4971c4a