Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68bae2fb676c051…

MALICIOUS

PDF

94.8 KB Created: 2021-08-21 11:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3a0f5a08bde5ee46dacff197f341fb6 SHA-1: eaf1b2149be84cc40fd4bd2d88ab8a7420a37bf2 SHA-256: b68bae2fb676c051a4251ae86f636a80a96a42fe912259964b508d919c30476f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress uploads or disposable domains. This pattern is commonly used to redirect users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bhk-aindling.de/userfiles/files/77208392031.pdf In PDF document text
    • http://gursakaryahukuk.com/images/file/ginojevokameb.pdfIn PDF document text
    • https://luminex.pl/upload/file/nogar.pdfIn PDF document text
    • https://activepymes.com/pub/file/bajatixexiledig.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072bebc7fe2a---gojebuxefelez.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be7ffefedb---valoveza.pdfIn PDF document text
    • http://atya.eu/files/file/nepoxepuzezisav.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/loxeruxudofiv.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc09fe2bdb2---figagilegabejulitozax.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/777650d17475dcd16f9a337eb55cbfcb/30268748492.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/vamilupusibaxaxanafaf.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e779bf60e34---lakejekilule.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/60424473331.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1611f1acf8f703---zusuvabitibibiboperejozo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160925cd087e04---4141175809.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/70026803447.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/bavova.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/80900671387.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/36178405395.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/79413799940.pdfIn PDF document text
    • https://migger.dk/userimages/file/rewimi.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/j3bg038si2go2p43ejo1l93pt4/patoditasirusezidanuxuwum.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c090f42ccdf---50318617813.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/37821021294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cuanto+es+100+gramos+de+mantequilla+en+aceitePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 11164 bytes
SHA-256: 62ed8044d140b352ea5970ccc4bc1b0a9fc7e4f73d625fb5dcb0a49ddd28b3b5
font_02_sfnt_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 17444 bytes
SHA-256: 55f1e1cc3a7304fc210150a846a26e18dcf99dcd7c271b6a9bbb67cda2b4802b
font_03_sfnt_off00013315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13315 1824 bytes
SHA-256: 065c7a4f11f9e75f6e8b37807bc82b370f7b2846456f0b3b832c619392bb01b8
font_04_sfnt_off00013ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA2 18532 bytes
SHA-256: 4ecc4fc0db16372db7c13e78c5998dd55a983dcfc74f1eb2494b53506d229f02