Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc272981de63a30b…

MALICIOUS

PDF

89.4 KB Created: 2021-09-16 10:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6fa2f20c789f96dba6dab34990fcc487 SHA-1: 53fc60de426955122a75db67db1f5ce83efb5f1e SHA-256: bc272981de63a30bff973faa8ee541214b0a5e881c9b05d0a817dc3949738df9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to various hosting sites. Several heuristics indicate these links are part of a phishing or malicious download lure, with one URL specifically mentioning 'camscanner latest premium mod apk'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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=camscanner+latest+premium+mod+apk PDF link annotation
    • http://nollve.com/img/editor/image/file/84651299436.pdfIn PDF document text
    • http://space-edge.com/upload/files/89324625671.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/tunidisexubazamutexozaxo.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/97077391067.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161306d95c7d5b---37798298848.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d1f082b1---fisezajukaninofoxipapex.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/5pt89m6a5ee4r616srgcm446j3/70615608062.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/53671464062.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/33594382396.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/57562508726.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/45298346372.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/zejetiwogasikewuxi.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/kejirigavudufukujegise.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335430ab5e4---lekaduwugunotipovotefuj.pdfIn PDF document text
    • http://vititanon.com/user_img/files/84891087317.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/39338605576.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/50410409823.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/87697483753.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/zavikekimegolij.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322763964cb---zirep.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/pujagak.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/76261503824.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/51336377166.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/kilokigisubejaza.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 16944 bytes
SHA-256: 46a7ced3fd8952f6e0e19181ec0913b25be4d62395bd9da58fc1dc9030a1169a
font_01_sfnt_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 10900 bytes
SHA-256: 8517fe04ce87509b0ecba6d59694a085019d33e8439c67ae9c79ec003d4e8cb8
font_02_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001289d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 17444 bytes
SHA-256: b75bc01ee2b6c02a93cbc5ce7587603a927baa329d35ee20db87551acea36fd7