Malicious PDF — malware analysis report

Static analysis result for SHA-256 a790953b409ff57c…

MALICIOUS

PDF

110.8 KB Created: 2021-07-31 07:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 635eaa41f20280e31376592a35ce2b43 SHA-1: c964b63aee10ba8673d92d41be64b10aed5aa085 SHA-256: a790953b409ff57c1909a8f160f8a35ea447f363efb3c1ad3f4e424c51d74ae9
96 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to distribute traffic to various potentially malicious or spam-related destinations. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/pdtepd2hjccbs9u1qk2ul2mvcr/4578782055.pdf In PDF document text
    • https://rybczewice.pl/userfiles/file/torelenumijufix.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/sodivajasikegilegabajuga.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f558d045d---75486040017.pdfIn PDF document text
    • http://burke-gallonfamilyreunion.com/clients/28163/File/3374539594.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/62781726166.pdfIn PDF document text
    • http://qca.ch/userfiles/file/nagutogube.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/30111312186.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b290bc39bab---rupurakiwekovofog.pdfIn PDF document text
    • http://www.asslar.de/downloads/92743936108.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/15ef0ff5632940129d1398482a89562b/70359098460.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/56421685323.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5af142e76f---riran.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084d285c1226---20582501963.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/rakitunubofakolaxipoku.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/d1ork2rf1fagno0e4shklb9m28/vazolobibosaguwura.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/78669341837.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/56570462476.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c560bf5a705---karutitizekukawapaz.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/zifapim.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/noxodita.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/60605518053.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/zipolegasul.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5us8rrqo5u1138g115omjncpce/nojomizod.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/nibanonij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=learn+quran+tajwid+pro+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00018369.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18369 23256 bytes
SHA-256: eeb2f4301020cfd31064ea874ff25e67043afc21ce2df41ac4db72bb2663d62d
font_00_sfnt_off00012137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12137 10680 bytes
SHA-256: 7b66ddb62bfe0f4f82aff6735dc323ffce6dca37e398ed21b8c893649e9d23d7
font_01_sfnt_off00013991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13991 19324 bytes
SHA-256: eadea56c063cb50978b79ea8172cc947b6e7b4e1202cb1de14397198a8149897
font_02_sfnt_off00016b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1