Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeffddc0e6d457c9…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 06:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a139c66c0d5fffa795d781c4761639c SHA-1: ec0d5fcde827eaeec2ddf71517101e3e63de69ad SHA-256: eeffddc0e6d457c95d6cd426023d48aafce34ee6cb5012b50968b25dfbba2236
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://stehovani-ostrava.cz/static_pages_files/file/tamamukipexanodabatuwipiw.pdf In PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/28631298350.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/18820972509.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/varajebewovemafa.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/18i5gjuqfdmaei8441emsrbrrg/1707620375.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/49920166687.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/fopipizeluro.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/ktd9q90gm3qk6b30uqd8h6kmgg/58545454578.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/hgrho42l590h0od84a084dova5/juvizebowito.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b45741c7660---90645011864.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/52538784674.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/kagumimamiwut.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/mugowegonaditigipivako.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/leninufatejatetuvisofo.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8614b66e59dcda900cc1c67bf7291885/gamimodogukabuladuwib.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/55074299313.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/aaf2da3d99457d473a888ef3c91424b1/xuwubakorojakenejalewas.pdfIn PDF document text
    • http://fgosvo.ru/files/files/79022081646.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ed1d82f8ff4f5b7c22512ffea95eb48d/89398505593.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e1b2063b6---basekuxutotewubugifuru.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/50443824347.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/varolugejokev.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/kumalibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=memotong+gambar+di+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_off0000d3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BB 17020 bytes
SHA-256: 3baef2707345277554710128ad3e24cd753e1c13fc3bd14672647ffef6409a82
font_01_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 10760 bytes
SHA-256: cd2ee4036183c946c04fdee460fc374e04a794d6aa9304b5b378831692cec5da
font_02_sfnt_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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