Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ae554cf23ed822…

MALICIOUS

PDF

83.7 KB Created: 2021-09-11 01:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9398613b2b994725ea7cacee2ab9fbb0 SHA-1: 98ab6b6fceab95eb548e515147d725eaf96cd9fe SHA-256: e0ae554cf23ed8228ea3dac414f0539ab0f67a0fc7a4607f0af3384140025f7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term' in one URL indicates a potential phishing or SEO manipulation tactic. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=the+nun+full+movie+download PDF link annotation
    • https://belitour.ir/basefile/belitourir/files/welijisexadepebekorarupur.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/42135955981.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/95470940918.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/18620387757.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/gukobigoloru.pdfIn PDF document text
    • https://stauber.lt/images/files/7448578406.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/81281486246.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210905_3D3E00F9C3C7864B.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/97076486016.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130e7ef2caf4---suxexinupevedut.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/44675602988.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/7312393702.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/74878117467.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/93193801486.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210909225418718616bhc57vgl2j24.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109100431281803.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/35764499108.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/65184351928.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/34997614138.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/jasisedegerogusizotumer.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/nupevet.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e2fd28d48---71241990766.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/39412852476.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/10184844488.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29d32db1c---neditugezajepef.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_off0000e525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE525 17256 bytes
SHA-256: 11f6061f865a3be24d31c62b75d0dd3e0552ccf95c82fd4f9ae92966d6cab342
font_01_sfnt_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 10468 bytes
SHA-256: 696e2df56397508173e9f2d84fd8ab182b512195ccf991e5e7721dd01bba5029
font_02_sfnt_off00012978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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