Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03a19d4d13ca089…

MALICIOUS

PDF

82.5 KB Created: 2021-08-06 04:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f2c815443e2c39df35fee99a1224b538 SHA-1: 620f12b94a1636d6a5a96e0e501a1e0b264e2171 SHA-256: c03a19d4d13ca089aa6a2705d037627f838de91216cddb9d6f72b80db6960fd3
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many of which point to compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of a link farm on potentially compromised hosting suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://caf-ljubljana.si/docs/88231955779.pdf In PDF document text
    • http://topas.lt/userfiles/file/87911074708.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c6e1dd37---71225649064.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/dadiwuwebivosewusofe.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/30f31f96fffb4dcc725a47b0b002c77d/649150548.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/vajimod.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/fe639ad1face7df6a3e9a7c3617e66b1/luloputokenaluxinekifefob.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/auc4a4i59iq6st2mclsfgofpl7/nepos.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/51904398586.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/kogesabugeborol.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/37504817020.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/wuwuzonikikunoxafami.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/fixisunixevagajeje.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/82272427239.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16073dcf1272ca---93983279162.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/16988442c9bdf0b265e2d9dc96631b73/kewekumetidebuxiwuvu.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/zozamukifomuse.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b80f25843fdc5cdd262ad5d48cc0eb85/xovinetefiwixob.pdfIn PDF document text
    • https://music-group-store.com/upload/files/27047198337.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f01e74df4---86988075093.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/d1ee74d851916fc857b7fa9457651f07/lakixize.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/bisoniwubobililutepimol.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210624032937.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/gajekorefoj.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a30a050395a1a3372e102056ca30048a/refigenejaro.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/jesawivo.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c95f85b43---xotimigosoxijelewefikavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=effects+of+merger+and+acquisition+on+financial+performance+of+commercial+banks+in+nepalPDF 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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 11424 bytes
SHA-256: b63ef77d405934a6b82bda172ef9815f75b6985d5cc21dd7a05d08eb1801847d
font_01_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 17620 bytes
SHA-256: f15f508dca3fe746e98e0bf127d33539d69c9a6ea26ab82ac3a4ceaa866f9b6d
font_02_sfnt_off0001236b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1