Malicious PDF — malware analysis report

Static analysis result for SHA-256 112e6fde4644bddc…

MALICIOUS

PDF

72.6 KB Created: 2021-09-05 01:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 90c10c1c8a768d3001315ccf604b1983 SHA-1: bd8141e686e0267c83eef097a22577a5523f7122 SHA-256: 112e6fde4644bddc2426ee6370dfd6e3114e9db8603cb597b06db2834a83d348
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Static analysis revealed it functions as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96456386649.pdf In PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/28630861949.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/bovujefakiwubifed.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/lawagomed.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/terilolipakexodogulilik.pdfIn PDF document text
    • http://castel.lu/userfiles/files/80628050955.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/saluribebemabiw.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/674929e3a53c34e48956a0dd9fe862bd/sakivitoramiranebosok.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/7742549277.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///paliwugevixadokuxabage.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3b278dff4e8fdd809609ae4bf0285287/29793835616.pdfIn PDF document text
    • https://granchefpremiumfood.it/file/41209978718.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/9780043212.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/62fip197g1vpmph369iqcltlf0/visifizabolamamiwukevar.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/vigotuwanenosonevimadoji.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/ludegukoragamagu.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/popujurunikasuko.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/06b7ba7fa67f1f39d0dc8eaaa5d2e6b6/leginukukomikoxuwotewe.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc780439a---jazufagererineneluj.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/faroteta.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/92713318713.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607915fd6b946---lovexoboxaboze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=arn+ribosomal+funcion+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_off0000b9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D3 16772 bytes
SHA-256: 3f5b751e4d280ad3265d3addd94099f320442735c59c01b5e5713244d666cee6
font_01_sfnt_off0000e471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 10772 bytes
SHA-256: 0a6a78586db263cb9896e8e1bbd1c33d9191b7d635e989110edf1f3ea0e5c859