Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b102174e2629c9d…

MALICIOUS

PDF

86.0 KB Created: 2021-07-10 10:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e3e51d62e7d42dfb76d34f9983e5f559 SHA-1: 29865cf178f9559a0594a10815341a461cc4b360 SHA-256: 2b102174e2629c9d9b555ffd2ceb87d9bf346cb5c105779e4330fc22a4ed3178
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting it is part of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample likely exploits a PDF vulnerability to redirect the user to these compromised sites, potentially leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16075c918012c6---tosebefef.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e6e61b2c78631260544246e7bc396c87/duluvaxajevilivekon.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/lom5h867totuhc4u7nhdcto425/jesejixugekawevizunuze.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/20121352485.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a175de0951c---35144193113.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa80978a64d---zegowamozeworofibunigadu.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/zifefumamikazederavifi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607af85bacb77---pesisun.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/14537643248.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/kebediritisari.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/kususopigaluzakuvodow.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/61616653066.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/pexomoru.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077245b4dc74---gikurikiguxijetaz.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608357a200f1e---mobujexunivitamisepov.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/0f6e2d97b3d04581c83f962af9a6b20a/digowilinekumifiwa.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f59b68fff---6595064731.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608768a0d0d5a---wamulofosifizoxupudagorir.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/4a1c1285ff9cd4fe925120b45106a430/nonajudepujoraxelawo.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/cf464e5789f593afc9ec926ed152e126/demijan.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ouh9nufo7k2pqs7gns16itu0fp/69653011772.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/kozen.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/56162584259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=naked+scooby+doo+girlsPDF 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_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 10668 bytes
SHA-256: 62626e37c30f37cbdb77f31d83350fffeae83b20047d85472bd0d4ada4ecaadf
font_02_sfnt_off00011da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 17524 bytes
SHA-256: 5adc260784ee1d433d3cf8ae197f9e5ffb3d8f61753c002b662a712a2906e55d

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