Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba61e4f74308a581…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 15:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3323e5dae42a2d03cc13c62fedd10599 SHA-1: b18fc3a387cfadaaf206bb8ae6fac60b0fb6cbd9 SHA-256: ba61e4f74308a5815137c74607d839897fa2eb4f81087bb25ab2236dd8d03ce7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/nrc9rhopc6bu5cn1u5kl62o0r9/kajomipado.pdf In PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/11267007644.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/27468465881.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136121a5a3c0---wutaz.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/98403498959.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/delukobenopegoninurinojo.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/lekupatetaxatojedavevexi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369cb0070d1---nigujavatafim.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/64128514347.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/fanuvumizekonobusonox.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/butiriziloragudafodoxi.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/92609940912.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/pomosotawetid.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/81813968896.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/48991339454.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4e85fe0f5b3f9e2dbcd99bd05ee06790/jisilojila.pdfIn PDF document text
    • https://digireg.at/upload/80949430849.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/susafug.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/56339278878.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210901203015.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec73c079a---pibavo.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/27845125879.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/felaf.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/28602506689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+uprising+moviePDF 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_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 17632 bytes
SHA-256: d63a14547fda1245b594e6d6e215c92cb4cd00d361aed6948b93b03869761c65
font_02_sfnt_off00012b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7B 10576 bytes
SHA-256: c709500ae5c9eba111272ef1b300454db2b07e6ed437d96196fd4d085c1f2acf