Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3ec6f1de2ab38f…

MALICIOUS

PDF

98.2 KB Created: 2021-06-29 03:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6c5d2c7a96b8a995656967850e651dd3 SHA-1: 6c598807935e2f9b22f4b9388dfb5af3a6381ec7 SHA-256: 5a3ec6f1de2ab38f93b4831830973ff5edf08f55f8872bc60e3cea11623a933f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites, many of which appear to be WordPress installations. These links likely serve as a link farm to redirect users to malicious content or phishing pages. The ML classifier strongly indicated maliciousness, and the heuristics confirm the nature of the PDF as a link farm on potentially compromised or disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://medvor.ru/uplcv?utm_term=galneryus+hunting+for+your+dream+tab PDF link annotation
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/22773630433.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/67a7494e9e1651bc227ca906db8cc0a4/gosutibusegev.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/98334835019.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/72898778665.pdfIn PDF document text
    • http://pgnsualumni.com/clients/872691/File/xixidesaludafumu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79f3d7d6ea---50262381869.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/96110145823.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/vagulezemozifixabomidi.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/d47d710f9097e4ab0b8999b973223590/lofujunutunuk.pdfIn PDF document text
    • http://martonelektro.hu/files/file/bisuladefovafukuwido.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/s0slahk5tavc0ft8aqaaub8vaj/gerixokijid.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/jawuterivolunipo.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/51063880830.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0b8401920---xufuwepuparutubowiwixisiv.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/51174697723.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/df936fa711b6076376fd37aa80ab3e6e/xatupopofafosifomamopi.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/jetomidedej.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/bibesewaraserefasot.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2090191ee---2910777880.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdda7f0c01c---42687460547.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b32264488e3---kekipizimitetijuxexilom.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e0a4ff1b5ccb4972771878ba9de6e111/rajesazigifuzotutoliba.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/57731579652.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbe9442b1---piguv.pdfIn PDF document text
    • 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
font_00_sfnt_off0000bb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB66 35672 bytes
SHA-256: 04c81d0ba54cebae0a2a7c36485546687491791d0c874df27c9948dc682f2a73
font_01_sfnt_off0001204c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204C 15052 bytes
SHA-256: dd7aa893038c2c3af09fe09f50f007abb9445ca3f2f9cb9e840e4f938cd64553
font_02_sfnt_off000146e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF8 11196 bytes
SHA-256: 533624c7720c8d2df767e353955fb2589adc4f36243dcb8371f069d917fd9006

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