Malicious PDF — malware analysis report

Static analysis result for SHA-256 9169d557c0b8e8a2…

MALICIOUS

PDF

116.6 KB Created: 2021-06-27 05:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6445b09d8280acbbc8d6cb9cb09719b4 SHA-1: 4f1cf7d6e915a37ead4315031e4f001ae3c02ecd SHA-256: 9169d557c0b8e8a2472bea3d91c4961bf4e1e4a7964cc9f447807f5c835b6da1
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the structure suggests it's designed to lure users to external sites, potentially for further exploitation or malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

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://fishboat.hr/files/kosuzigeginododezuzomaji.pdf In PDF document text
    • http://albino-pitti.com/pub_img/file/mavosoxutos.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/rusonizizunogafijeka.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504005724708253.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af83fbf3c05---47633895646.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/56805234383.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2e90ac214---11638989793.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c1827e4140a1e1f87c6c43fd6619565a/31982730096.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f404231f0c---14605230301.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e10a6870c853f363cffab7a366c4735/43525059994.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e11d18df38aaf7100d9e8729726c45a5/15344110828.pdfIn PDF document text
    • https://abeess.com/userfiles/file/93029874173.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763cdc655b2---bebepejarigigizisujidomug.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/45028266679.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc08374ea---febakuzet.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2e6ee7ca110706f5c3bb58ed417dc4aa/fazowawatadimubodul.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/7129d7d7a010034a50eb8ea85dcef3d1/28214219212.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d189ced496---57977982082.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea23e7c4c8---gukudiwevegewewejenole.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce269468e3---97938681959.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/5inqvctv474i9en8vgld349elr/sonebilavexokopozugureg.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8bfbi4kv05jlnleebjl0kjdj9l/2638999898.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/376325241029859894953723ae2a3521/19434867942.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/9fef6e2683130bc9792f5291ae6a84d6/pajolakuw.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8o94jf9r0npvd6iakr98hjoqc0/xidupojuzowide.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1499ae930---tabapukoletogunakajozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=insight+student%27s+book+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_off0001665e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1665E 10788 bytes
SHA-256: 6423765b1bbf56c45122fec1ba5b7eab5061bf41368a7aec54da36b101ff2d32
font_01_sfnt_off00017ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EBC 17736 bytes
SHA-256: e45b8532b4c05b17b2446b92a237548e6e05754960befabffad3348a07442c5d
font_02_sfnt_off0001ace7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.