Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6eb86275c013ff…

MALICIOUS

PDF

91.5 KB Created: 2021-08-07 14:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a9fd66b5dd1e09d7128157b2d8b4c343 SHA-1: 806eabf5ede53737f84b394c0957a37f1bdd2ca8 SHA-256: 2f6eb86275c013fff5f8aaa866f8230c6f193bb7be9c3dc07e7ab920b01e41bc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, many of which point to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba5b22356---sodafitudejesevi.pdf In PDF document text
    • http://artecgroupservices.com/imagenes/file/zeradegakokutixekituzine.pdfIn PDF document text
    • https://tsolisp.com/files/file/96749199759.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/zodalofuzaxupofaxule.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e4de0c112---61931787198.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/58883b6c20893041e84fffdeb66a403c/keledasigipurukowibaduzet.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/87779194134.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/28727677330.pdfIn PDF document text
    • http://sun-eko.eu/files/file/bimiwiwevibi.pdfIn PDF document text
    • https://mytopics.it/uploads/file/kusebibobusiwufe.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c3ed5024f81c1f7c4b85f504620b8548/80794204097.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7tidc2j3g183pq50qmkou4hdf4/wenatekoledikita.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210717_011947.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/62a7fc38ee37c1a601c0129cc1db977f/28864433896.pdfIn PDF document text
    • http://derma-dts.de/files/file/sofegodagusibaru.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb55e23026a---mifirerivo.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/rikepoxukabopoj.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/c3adb97dc4cf8c20fddc0ed7b18efa95/wodoligevidemod.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/53d6c55dd76977294d7f10022ddc9c40/xaduzijaviwemu.pdfIn PDF document text
    • http://contextuae.com/resimler/files/libosusa.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec85483b3---bofaguwedugosalupig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=o+que+foi+a+ditadura+militar+no+brasilPDF 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_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 19256 bytes
SHA-256: 8130618bdc98c1be7bbee91baacdec944bfcefb74bee95c2d3a7680a07123385
font_01_sfnt_off00012ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14710 10928 bytes
SHA-256: 037fa397509660045efba5afec0b46a65fb7c52eb351a2f9bd1d7f6284c6b551

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