Malicious PDF — malware analysis report

Static analysis result for SHA-256 45817d34616f6312…

MALICIOUS

PDF

85.8 KB Created: 2021-07-06 17:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4cc8b8be6dbb9602075322a6cb0a8d48 SHA-1: a17331ebf953a5aade42e2b001565f03b29f31cb SHA-256: 45817d34616f63120e7d28f6d1969ef0ae3144fbcf4e5df601c3ad0fefcae4d6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ssaisarang.com/ckfinder/userfiles/files/jamikexowazogojujezi.pdf In PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/1g0eth7acfi3cjvngr5ph6jj80/98913146626.pdfIn PDF document text
    • https://aashianarealty.com/file/zejugigoxafepepoka.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/ba457cd464e443b969f074a5ea71d784/xenavabusisuxiwemub.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160849da464508---19179123109.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/riravudawudaw.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ovsdl088sjej63q1hocagsmj91/51519766547.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/a0d5e75dfe6a85bd21563a430adccc24/32527799578.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/radozovujivelom.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e67240de4e6eaf4efa519b8aaccf0745/divofigevalevawogokatu.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/gijalelawidi.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/26032454186.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/ccu5ae7a8vtr5cfkhokhcnfmh0/junatajasusarodade.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/luxozubopopejadifubetebe.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/ca5471cbad3befc054bb0252046b8237/56818071172.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f6aa7d91bbbab5ed5c68870ae8d7ca84/jilixefutafokutigu.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/3voj6kmm5seb33ubi1iv3o08vq/9358335564.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///24230792624.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/80714322447.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607426dabfece---vepikuvem.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dfb29117a---96602237418.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/bdaf79da836ee07249dad89a6dbd271e/novodabigasojolujud.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/le7pf1go9hlrjhfvcoq2gil9f2/gasatavuj.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796d4ed66a0---77155632374.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/34197354282.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d08d12c2f---potarovote.pdfIn PDF document text
    • https://invest.pl/userfiles/file/78237251702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=centipede+in+my+plantPDF 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_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 16872 bytes
SHA-256: 5887c16dde565c6c38ea825ea667d16250d8cba1074a9251b489be552d09bbd9
font_01_sfnt_off00011a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5B 10308 bytes
SHA-256: 756ecb2ad23c266ec6a7333ee5d5c10499be475a64721c02cad1b4f8b274b0f6
font_02_sfnt_off00013199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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