Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b642e1c42784b6…

MALICIOUS

PDF

83.6 KB Created: 2021-06-30 10:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 58e93d0971fc627b7a79ac9e1ca2d58f SHA-1: 92194473dfad504c444a01d09254b9744be0a6d1 SHA-256: d0b642e1c42784b68aabe30cfd97821c355392659b96bb6b6b27e9a8f435b1f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to potentially harmful content. The presence of 'utm_term' parameters in some URLs further supports the phishing or scam lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0f8229de7---29188768187.pdf In PDF document text
    • https://accuratesearch.com/userfiles/file/60444326770.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/refipibamuxiworefe.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b011e4751fe702acc40697be5082b928/76848949820.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/wowateximajitokagu.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/9559af88235b8c6b42bd795f4962d77f/wufupuvonemivapogewi.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/dn5fj4viptural5c7p2jbvmul0/pifovofamerobejinitorew.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/33012364216.pdfIn PDF document text
    • https://areicon.com/images/file/40239006445.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1ee901141---64482844307.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/rujirakizovefefige.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/b5c28760fb5464fa47f6c672e3777cc2/80428757950.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/76114747871.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b21632546c8ebf65fa87faee5e1ab144/54467705172.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608db46bae959---mifefitirifawijogel.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6f8353b64cb9ffbc2d629a9b980549fd/wafakumilobexewegerurulo.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c650243ab59e56a24d86ae036b58b8a2/xowujorebo.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/terogiramunesetotid.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/53599209832.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/lutusunotumavisovomuvobu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084313511f62---jigelaxewifu.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/707acab5bc053230b44111dae48e7487/9460031625.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/59737818983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=number+cake+baby+showerPDF 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_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 10664 bytes
SHA-256: 27114eb78980c53100e2b5c753004855cf07eb029bfc8eb39eaf06c2edea0f0e
font_01_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 16900 bytes
SHA-256: 4dd3a157eb0188cca14058c4ff71b3574653247aa2e3cff9f5738e6fc48d8cf0
font_02_sfnt_off00012943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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