Malicious PDF — malware analysis report

Static analysis result for SHA-256 87aba7080997a2d0…

MALICIOUS

PDF

87.7 KB Created: 2021-08-01 18:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c550d6cf892a0360da17ed25136f276 SHA-1: 8b789b417f0a4e7790ba4a0d888564da4e2d5f5b SHA-256: 87aba7080997a2d01cb3a7f93c2d4a292972a5cff4754c01886d338bb19d6eee
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various domains. Heuristics indicate this is a link farm, likely for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal appearing to be redirecting users to potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://dianacb.cz/userfiles/file/vikore.pdf In PDF document text
    • https://tessuno.com/upload/files/60fb2c2879a96.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/18864305295.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17240e7e09---nipasijalawilepomu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b818a6a02---50397090557.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/moxelobugitizegifasibi.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5aa439538fb07aea286e8f265928ed60/20867478779.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/88251222387.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37dfc46b3e---89815847590.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a1625b90d3c---givinomufexikunuwobupake.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/59365763019.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/67973118790.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/tifafisi.pdfIn PDF document text
    • https://binhvi.com/upload/files/70823623132.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/47446799386.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c859fe93096---15047867910.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/62158173448.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/77636890565.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/d9pjf6cqt2iacebdookcc8b0fl/gusosojufesi.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/wepozebazebozipire.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/8npsno3vskciiaqicj50mi8tfl/10921987366.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84fc39acd3---93125802023.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/04113234055e4dbafb19555f629a0c9f/kizigedezufamebu.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/korefizibifoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+clean+whirlpool+duet+steam+washerPDF 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_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 17392 bytes
SHA-256: e6384c659c5a5a234306effa9d97c78b2f2ae7ccaa9f79d96475dff4e2d1b912
font_01_sfnt_off00011f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13755 10956 bytes
SHA-256: 3b884f328ea36d7bba36a20095be3dcffbb3163833e3388bc27650ff6673a92f

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