Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c3067fe05c05d5…

MALICIOUS

PDF

78.4 KB Created: 2021-08-10 08:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6064b9edd5d9debf9cae1fe18839ca67 SHA-1: df0aac2cdff3520508b1b3a56f9ab215975bd0c0 SHA-256: b0c3067fe05c05d57b2b54bed9bbb79d157abd05df469e8d83bf3de41b08c1cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The presence of embedded JavaScript and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to phish users or redirect them to malicious content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://minlinart.com/archive/upload/files/38265260272.pdf In PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/bototuza.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210702130836.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dcd76397f---46072365531.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/jaduxuxadotojuwari.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/me8pfenuhrac86dufeeqaidjde/38954871989.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/vr39llej27o33t8b3h2483t03h/vexitokegerutajitelazux.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/jokuwumaw.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095398a17cb5---tipimexisugezagatedirubes.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/lukamajosajedufirowune.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b29a8d577---34002466247.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/46198135811.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/69378238979.pdfIn PDF document text
    • http://vivalepurrexotics.com/clients/2/2f/2f65fe2011b8f0b07f64c29a74835a02/File/2634115820.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/47773302466.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160de5a4f316a3---mifixogumaz.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/v8gn5fuc46io8j5figpgc1lhm2/sovumelokogazivudapa.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/peduvikebanavinulesom.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/fajuderen.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/140674924d2276177b5876694c70b7d6/24779431710.pdfIn PDF document text
    • https://alajuusa.eemedia/contents/file/94901377979.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/rizizigipanapaxim.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/eiq34clpm4o5qsk9kpcfjslekq/vukawitidorukoge.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/46064977759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=edtpa+task+3+assessment+commentary+examples+secondary+mathPDF 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_off0000cf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF79 11152 bytes
SHA-256: f6cf8885375f82f089ead64789c8a1908b7474355299f0c177b116fa0fa9068a
font_01_sfnt_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 16404 bytes
SHA-256: 66834de38d8ddb5f586eb498cabc7fbd296e37445fa76fce1a88dffa36026f90
font_02_sfnt_off0001135c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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