Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b19c0a32c78895c…

MALICIOUS

PDF

107.8 KB Created: 2021-08-19 13:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 740d4f2ec54b79762112acd57139cd1a SHA-1: 7177f7be96e337f037285285090cbb066cef2219 SHA-256: 3b19c0a32c78895c449cab1d8f1c683004f4537d1c3fb4feece349d9ce412ffa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the nature of the link farm suggest it is designed to lead users to phishing or malware distribution sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/36bb84c2cf41dc255e2c34fd28668ac5/65119089786.pdf In PDF document text
    • https://actor-conseil.com/files/file/dikokupefojezumoki.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/dolegirodurilosomiboturo.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/v9jp3tje4780j80ukh6v6ac11g/mujupatatodaru.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/fonorakijimadax.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/d273e3c71a18e2eac6c18d7fe83a5ae3/fodogasumevebop.pdfIn PDF document text
    • http://edallyshop.com/upload/files/49526519577.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/882cc7d5f1e491fe50c1a66715a49042/xitovobirezobisomadab.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/94004183655.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/ba2e9a27fa6ac7c3983facd2123b8455/bomewupirajudu.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160908138466bb---34644287910.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a252c33b3ecd3f5cbc7aa0bcb1169d23/36559613507.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/n7i3628s6br40olqmcu1k3558j/31241094798.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b9d1091d08ec2fa8450ce81007673eef/gokonafafujexanafunuduz.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bac85978f0---ledikuletidutug.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/75653147355.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ca836b665a1f4459ef050efa46fc31d5/23899199973.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/24881194118.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e1be6fb80be5d0840953980cfb0f39c3/26670214047.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/tetonivijonitugedimuwoj.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/mawupevawoje.pdfIn PDF document text
    • http://cpils.com/userfiles/file/jevakenefojujokunepufemu.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/sobatefag.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/61581901140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=lecturas+cortas+para+ni%C3%B1os+de+primaria+para+imprimir+gratisPDF 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
font_00_sfnt_off00011f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F84 11076 bytes
SHA-256: 3d23c319ab027547577d3093987d34a6154c5a929a412cd01bf5de5a67491946
font_01_sfnt_off000138da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DA 19140 bytes
SHA-256: 555ffe9e335a63458a83fd68a61e88bcf6b9a89a872eb4bca7cf578986433733
font_02_sfnt_off000169a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169A7 17504 bytes
SHA-256: 0b4b2676aff05a369d4163ffe00cf7f13052446fb04b9aa9e6dbf30e7d948870
font_03_sfnt_off00018402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1