Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcf53dea6a48187…

MALICIOUS

PDF

85.8 KB Created: 2021-09-06 11:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84bf64e46323e21dba34c223c450db47 SHA-1: 5b0aabdb3641899c6af9c48018e4ccdee76c8551 SHA-256: 9bcf53dea6a48187d44da992cea114f044d7330fa1fc1bf62074637246e7b3a0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The presence of multiple external URIs and the nature of the hosting indicate a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://younewstoday.com/task/userimages/file/95932004899.pdf In PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54d0ed1db8---danipedexed.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/wupisonokowake.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/fotajafovabe.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741172d1dd3---19319409113.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/31407674265.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/daal7udu83l3d0d5pvvs60331p/jojulowasebofe.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/63570627158.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088be6659af1---dojifexurul.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/652900d2104cee46af84babccb214895/geboxotokedupim.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afad4ca7eae---nuvaroxinotamijupa.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca62a43532---52312485544.pdfIn PDF document text
    • http://keitbg.com/images/files/limedepivojinidaxali.pdfIn PDF document text
    • http://balone.net/_upload/file///8953987459.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/43854214585.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f224d73f6e---kovokujom.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/sesipisedewawudozagewiv.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/ditowapaxivava.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/kobilugep.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/16111701118.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f56b7abe44---pomotasowapikuwiwezak.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/sirapa.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25de1242c---86972920105.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/19119497088.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/farodinawuw.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/38134922415.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a66a0eca668---monefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=surface+acoustic+wave+devices+in+telecommunications+modelling+and+simulation+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_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 20972 bytes
SHA-256: c6824800bc6c29799872fb8e1ca903ec27e8bb8066294274f2146c32b2efec65
font_02_sfnt_off00012df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF2 11288 bytes
SHA-256: 8f61ad3a5de7d7f4663b3c4ce452267c7801143d5ef2aff24ceb6af2c109c7c6

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