Malicious PDF — malware analysis report

Static analysis result for SHA-256 875e33622d3dd73c…

MALICIOUS

PDF

74.5 KB Created: 2021-06-20 23:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1e2f86b508d40f3d72a53447b9dac5e1 SHA-1: d71c9bfac83719f8846c45996a7026885a320cd7 SHA-256: 875e33622d3dd73c8f045d9be1b624a22b7d0ff075e4c6ed8357fc6020c7458a
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a lure to copy and paste content into a command-line interface, indicating an attempt to trick the user into executing malicious commands. The document also hosts numerous links on compromised CMS upload storage, suggesting it's part of a link farm designed to distribute malware or phish for credentials. No scripts were extracted, but the presence of the clipboard lure and link farm strongly suggests a downloader or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/16cb08d5825aac94af12c06c4319ef96/50223033050.pdf In PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/at88l0di91kobac3r26t566sai/balixolatika.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/37392b203ea4f42f12a7dcbb7818fc39/49979608519.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/52bf94b9087d6bf6df57d5a3fa89ed67/jawaxezofopitowane.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12333a68a5---wodusemabujizux.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/pe8pu1cp11q60en8jiaj7spit8/47928529768.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ij2ff2j3pt10tud0ig6jbal5jh/55552871441.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/7b163b0f97f39bbbe7d0edb85e867486/63876556274.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/gu4a3p3ls0kvgk9j4um14r8530/67731706369.pdfIn PDF document text
    • https://activepymes.com/pub/file/dosim.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/69050786325.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/lipejirave.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/09553bbed49ba90bf20a1f575c23aee1/43911035044.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c98949a77---89760856023.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/28879221013.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071413aef809---28672781701.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/2b6n59nilq53uplnd1838oavnb/29067861323.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210516150757.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b79cc58297---watigajataxubawemakebofor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sultan+full+movie+torrent+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 5132 bytes
SHA-256: 33a2444c5661fe6404a0f8bfd83724d6d7f1cfad98b4b9e7c0cdc3006548f857
font_01_sfnt_off0000f756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 11060 bytes
SHA-256: 416638ecfa687faa28e610a56a92f4173e4fa9d4c555a39665be15bd5dd50cb6

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