Malicious PDF — malware analysis report

Static analysis result for SHA-256 319d19a66d72d17c…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 01:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9f59948ad087f64c164af3edb8e3d7a1 SHA-1: a548c5a15b861b03089bb48a8faaaf1fc7ff1031 SHA-256: 319d19a66d72d17c5dec6eff7bc0eb8e714f3677cfc51d05645fd14c78df666c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely to distribute phishing content or malware. The presence of external URIs and link farms suggests an attempt to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://nestsearch.in/admin/uploads/file/nuwogijizapobajotima.pdf In PDF document text
    • https://xn--b8qxb801j.tw/upload/files/guwatimiwaseta.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d08730dc3---xegonarofake.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16084733d7d13b---jifijosikuje.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/vunuli.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/164d910f3574cd5a8b1974527280194c/96701757747.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/8oo2o0q5ev9a7rg0opu3mikifp/lakibibapubetekazaweruj.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/kogubuxozemixuxa.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/65419244042.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161030626e2e13---86739487497.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/puponolexogigoku.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/73738789713.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d808472ea3ff2b91911ed28260b911e2/jozotodowutom.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/930d653bc8739bea5d5a1eff31816029/pizuxoban.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4de7da4b---ditakizapezotulon.pdfIn PDF document text
    • http://intersonik.eu/upload/files/59854787436.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/3004009961.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/e84rpojgssh02ltce6omjir10k/nedewaxerelaw.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e9c8899a1---65385371342.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729b4e8ab01---gewume.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e07e0c7a50---zedurupuvetaxusumuram.pdfIn PDF document text
    • https://ptogel2.com/contents//files/63785443655.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/xototakijobosifik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=financial+%26+managerial+accounting+17th+edition+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_off0000d37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 17068 bytes
SHA-256: 6248b287e4a949f678b4795775b0983118528af291adaeee4a016c795479f81e
font_02_sfnt_off000116fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FA 9576 bytes
SHA-256: d52e43a56cdeb94f1fe1e0064a44b6fff47dcdc83dfc48e5b4651fc8259616d2

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