Malicious PDF — malware analysis report

Static analysis result for SHA-256 7197d7e5882a898d…

MALICIOUS

PDF

98.6 KB Created: 2021-07-06 23:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e6f8313c4add8dd52f53a754276a35d6 SHA-1: 261d31c4b826e1cf7c7e11726d28e29bacd4a625 SHA-256: 7197d7e5882a898da8c37eba16dffafcde5c3e0e4e071ebc2df9987d314ac43a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content or phishing lures. Although no scripts were directly extracted, the nature of the links and the PDF format itself can facilitate malicious actions, potentially leading to the execution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b685c6e2930---diboveporafavosakaboja.pdf In PDF document text
    • http://amirafouad.com/uploaded_files/file/galoz.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/varawisunefotufox.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bcaac52d1---nofoxakagopotok.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57311db9e4---12450515271.pdfIn PDF document text
    • http://esistore.de/userfiles/file/9466237653.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e037a7c1d43---43897501958.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4430dea0b---runitivezewipa.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160798f7f6c3f4---37711903610.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609095d5bf085---3533342342.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/h73due80kn2jij5rh748f31abe/tiredivewilibigu.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/19576474031.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1c6c5da2d---jinulilorexe.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/72068631580.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/memuxetidegetesevi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/uv27fc1g7nl46v6iqr953ua4c2/6326592161.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5f2f72281---woxuxudevinukab.pdfIn PDF document text
    • https://businesslife.com/content/file/19090143986.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/cn59k3al05s4k92b0j8biotc34/sefusipib.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/b0a91ab79feb8c13966fcc7f36859f24/25346532306.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/bewimivegofotawu.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/09ecf162b511bfbdf70feba27adf1453/rorirokibef.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b6ad9c04c---38560951108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+amish+shunnedPDF 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_off00011e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 17972 bytes
SHA-256: f9f34714cd83cfdcad9faa0d77d4108684947b2195cb26aaafc5bcadaf7cc2f8
font_01_sfnt_off00014d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D18 10212 bytes
SHA-256: 8fad4b44052c5664f5ccf0e2feff49662a5e7abf691b463f8e5fb925496df2e8
font_02_sfnt_off000163bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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