Malicious PDF — malware analysis report

Static analysis result for SHA-256 f176c24cb020ce69…

MALICIOUS

PDF

77.1 KB Created: 2021-09-20 17:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d023bd98a80584a8c3970581c02a1424 SHA-1: e8d0b867e764edfc2d6d3be54d64d2cc624a82c0 SHA-256: f176c24cb020ce696f56fb39f47bb6072f4314990f087b23c235d48400fdf485
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified the PDF as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=superman+wallpaper+android PDF link annotation
    • http://go-pxl.com/uploads/files/48217160726.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210904184848.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/zugimevubuk.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/75673798780.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161386ec194c6d---rixuxemejezoluxoponunem.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/55851517428.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338bb4d2495---refejazabebipasemem.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d82d2a97a194282f59eb8b1efc5b8f87/xasusuvutonenevov.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/40552677160.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/42254138849.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/cd7c2c8a9f4399e881fd1bfe3e36f161/69047182889.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/pusolepa.pdfIn PDF document text
    • https://hirurgija.me/files/19320600772.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/51442250072.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/wetenif.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/68745577873.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/29640237689.pdfIn PDF document text
    • http://abnicum.ru/files/file/93355076943.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/sidegitepe.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feb788b266---642151018.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-5/20210905011317581542.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/62973389068.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_off0000c91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 10548 bytes
SHA-256: 6d8432285d45441ed43199200efc729ff03676ec3b508b3c1d6cf4864ae74991
font_02_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 17812 bytes
SHA-256: e4ef1676d106ab05683b4307709546db9bbf02f9234ba9d0721e5dcb7af56d84

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