Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f90ab1f5700d66a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 08:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 48f798754debd0127ba927fdb5e45fc3 SHA-1: f8a180f4c7e24cf0426b4d70ebfc4c855af18953 SHA-256: 1f90ab1f5700d66aedc14dc43f843bbedde23c6bb2347c91d33963f1ebd37468
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malware distribution lure, indicated by heuristics flagging it as a link farm pointing to compromised WordPress upload storage. While no executable scripts were extracted, the presence of numerous embedded URLs, many leading to potentially compromised sites, suggests an intent to redirect users to malicious content or download further payloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://albertf.madteam.net/ckfinder/userfiles/files/diwusedobirovorope.pdf In PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/nafiwagoganobejawuzi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b60eef033fa---kuxuwanu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cab444b4e644879fd30b74a5253d3223/54043142763.pdfIn PDF document text
    • http://ty-int.com/files/files/xejexikozenukovetixo.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/4358157210.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/munanikubixozonemife.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210728_063404.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29a3148986---14883608158.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202107210858511907.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/38926855022.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/823f5c5d3f0f705fda8435698f16c840/bojafivoxizesutodekopum.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ae4e9317f---93961839898.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/261uhahc1g2gd3dqoucqtgbljl/revutumubowaperopabixur.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/52450498217.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a4c87c7c1f933e2a15940350a2d30670/ralozaza.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/80423213074.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/zelogegafaxejepudifaz.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/6fp33abfminhhuqul5dds4c7j1/4122009362.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/remenusesugedodigadiwuzen.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/a0b9d172e2e7fdf99a58783655064163/lezepovubumisedajiwuwo.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/40220483809.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/rivenalixaso.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210624_F57CAC7C9A4DAF59.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/88539063212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+you+get+iron+blocks+in+minecraftPDF 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_off0000cb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB67 18360 bytes
SHA-256: d346eac9ee2d8a23be228ed34478524ec3f80ad97dc64250a83b99df6fde0b37
font_01_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 11344 bytes
SHA-256: 7bac45093db886238c181cf0e9b91906839fc42dd54594e874f04b0b58a8c0d1
font_02_sfnt_off0001166b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1