Malicious PDF — malware analysis report

Static analysis result for SHA-256 138768a4b8e7b0ec…

MALICIOUS

PDF

86.0 KB Created: 2021-07-16 03:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 259deb33a823a95cdd076797170f4f3f SHA-1: b9ee9aa2263ce1868f7802c000dc5d6b30b722c2 SHA-256: 138768a4b8e7b0ecefb2e76a6b669bafa5cbcc3fd150f528dd6bc3d2c2ba77f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent but reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe59a3c5b3---narupan.pdf In PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc83f5fcc1---difokavibe.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/kazonun.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/wadekupulilenawutoreves.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/birizedafonefosuwifoboja.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/cb2c356ef0b785fdddb8224561e6f281/janulewilogisegizowazulel.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/40729741030.pdfIn PDF document text
    • http://askort.pl/Upload/file/lenusugel.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/puvokajizozotoza.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d39937089828dfa9666970db15a25e97/32705703391.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f45ad1fd5---xofiz.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c58cc41d5---20263171106.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/1f12b48680f95987c5268b7e7701ba82/34482208379.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b051368b8e9---84368868519.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/66384360040.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/gelalirujefis.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/85218fcf0925489758dc065bb245dcb9/16018849021.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609ddf49bd7fa---49062578317.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160920bf01ba32---42354362941.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4p9kqr79eptr6nsoab97r4a9a0/3745083604.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/295jakcnojs182d3hdcohhbtvk/48695616775.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/fupumajiwasodexominudowu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/55212343782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=performance+review+examples+pdfPDF 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_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 10936 bytes
SHA-256: d2649f73b4fe6bf3b56586314dac43094192996a2af5ad1fb7c089944a1da765
font_01_sfnt_off00010367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 17544 bytes
SHA-256: f3436b4733337a48a467fedd2266ef7dbd09a34d602abb5f2de6b7ec271605c3
font_02_sfnt_off000130f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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