Malicious PDF — malware analysis report

Static analysis result for SHA-256 50554e75bc59dafd…

MALICIOUS

PDF

120.7 KB Created: 2021-07-18 10:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 84c607ec111bdc341da012b87aa75933 SHA-1: 3203bad16f818ce47b5201dda2399d68dfb0ef5e SHA-256: 50554e75bc59dafdee863a2f764cfc5ad19f6d1bf64d81f846357a27f1aa41c0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://alpha-cp.com/userfiles/file/19490494396.pdf In PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/vazupemoxup.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/fee534fa4766db2f5eef9a17b03927dc/16929395119.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3de84c72e---xeluvokosotuwalikin.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/3006316517bc05c4fd21d4e72f060766/novixadapulavuk.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/62f9e74e40fb4a0ddce08dc4908e4c8e/13851776560.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/paxisibiwutu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f13ba8c0b---69254895038.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/zogux.pdfIn PDF document text
    • https://animaliadielisa.com/file/63366722621.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/tuwenexok.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/21772337487.pdfIn PDF document text
    • http://taniaandjohn.com/clients/874109/File/bewivano.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/fe54a29bdb9520123f82d35eb9b6eea2/dokofepunikadi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/0be7d50e578ed991bf22c3219c97cf95/62902829286.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/1au4eka2dk2nflrn9tcjvh7ku5/kupimoxeneb.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090cd058d9e0---pigovep.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/butin.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/forusitezudosideza.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/nosajim.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/90798955898.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb7b3fadd---midapadameru.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/903bec54b971feed8602a83621e3f0c0/55779004067.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/vewemivigux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=phylogenetic+analysis+of+protein+sequencesPDF 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_off000172c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172C6 11120 bytes
SHA-256: 774579cae27f931428a23abacf50855666959a19efc0c65ce84e19d29152ae6e
font_01_sfnt_off00018c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C69 18616 bytes
SHA-256: 39c1b803ce6010027d573958aa62e055991d83dcaf369a7765bee95568a27b6c
font_02_sfnt_off0001bd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1