Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c9db49870eaae7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 20:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eea38ad0754049ca0c5cb1de0741a0dc SHA-1: 547dcf1934f2395f7ced7bb13634dcb9707bae62 SHA-256: 55c9db49870eaae77516fe3fcfb0214ffc4182aed5fb44e4d58e59e0eb3e0254
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to external sites, many of which are hosted on compromised or disposable domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://brod-plovdiv.com/images/linoteviluxata.pdf In PDF document text
    • http://locke-3c.tw/uploads//files/202108100718461738.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/rataguxovik.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/91034454297.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/73446260952.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/161149dd2435ee---zivemaderosupudopes.pdfIn PDF document text
    • https://unosms.us/userfiles/file/gidogoriw.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/12601234995.pdfIn PDF document text
    • http://deauville.ru/files/file/3533005198.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/65686971084.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608098a948f9f---tetikezewibidez.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/77944662347.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abc1f77b17b---rapezoturaxetip.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/19023163896.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/41054959113.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/9013428436.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/p8ku4a2srhtko8tcev9mmg3d87/remujujorileluxi.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/tanixejiguvasap.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/33849987930.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/nld1mpiq67aa5s8j5dvqepp8a6/burenijunafefaludizolidax.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/99f9b4f3fd6dba2da44ac6dcc4ceb28f/zaraf.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/brdmsd7b6877dhne5annmb13ve/jafax.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/wetatavabapojagelikamaloj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=subcooling+refrigeration+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_off0000e2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C7 18156 bytes
SHA-256: 7ab5940d37eba5f69ee2f2212bb3e4004c487bdc32c2d1b6fa79414c2c59aba6
font_01_sfnt_off00011170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12987 10944 bytes
SHA-256: 7c6c2e6bfd0c8adf85ff73aec4bd45ed7441edf676a5348715fca6ee635dd240

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