Malicious PDF — malware analysis report

Static analysis result for SHA-256 1049f91fddb5d1b3…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 03:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d4e2531d44f1cf60ba39ab9b0c0fc397 SHA-1: 2c1614c1d2953ded7c2beffcc09a2921fe16d0e3 SHA-256: 1049f91fddb5d1b387f6ea0c690f32cde9044db47262ce68447f67b36dea6cc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=trash+can+android+phone PDF link annotation
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/xiwubejujapamibo.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/wurulufilekiselezurezaw.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/36746314218.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/83929002017.pdfIn PDF document text
    • https://preciseenergygroup.com/media/tubinewejapi.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/gibosezejabixegewaxefim.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/nilikejumanemuwokiw.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/31643210196.pdfIn PDF document text
    • http://stl-hk.net/userfiles/91303476066.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zevozinewufipogarasenoko.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/69173018324.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16144146c90532---42659746769.pdfIn PDF document text
    • https://tele-video.ru/upload/files/42451676485.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/bawodokofagutipadu.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/papewuwiwuxijabu.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/nakuzineduweja.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/92499456633.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210901_1FEE46E4CA5D77CE.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/11303672848.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/fa5315eee000c350b719ee074042b0e6/24594194713.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/68638567250.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/fixirekudolez.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7638b1fa---rozikojetowufepo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/1441193a7dae1d2d184e93323bcd4523/bunivajekukifo.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/14009614638.pdfIn PDF document text
    • 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_off0000e4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 18324 bytes
SHA-256: bb8aac34e5b0f4c1421e72dba55d107e0bb96fc18bca8534972766bb81cfe0aa
font_01_sfnt_off00011464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7B 10432 bytes
SHA-256: c642cbc9fca708410989d1a36803fe58ef4a73714000152ee25e5f1508ec84fb

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