Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f0737559405930…

MALICIOUS

PDF

70.4 KB Created: 2021-09-23 22:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8f27e427cbb55922eb3e2ef7e2f8a62 SHA-1: 550505f394325d0f8de893750ed5f8e40dbc8dc7 SHA-256: e1f0737559405930687dadf2ff49b2538f9ba9d42a623657ed132812f4ab7f2f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware delivery document. It contains numerous links to external websites, some hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of these links and the overall structure point towards a link farm attack pattern.

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://infrive.ru/uplcv?utm_term=how+to+mirror+phone+screen PDF link annotation
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e7cd27e9e2dd83c5495d77b66a3115f1/pujekokalukojizowere.pdfIn PDF document text
    • http://polletnv.be/uploads/files/26047596685.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/27273712269.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/1855370475.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/sanazi.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/10379369780.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hgo6smpo0o0jt0p1tj3qlp89dn/gixavibulivazavevatejugol.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163082141292.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/rofagolupunotoja.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/nudukexovepena.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/zixizuv.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/14740970327.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/vebawiwalikapekewaxeni.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/69286256008.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/96546692787.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/wamubotebe.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kadunofinimuga.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a53ed0988---sokakesibimutorezifex.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/sakepatitejagupe.pdfIn PDF document text
    • http://scsychem.com/upload/files/81955556346.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/turusupoxi.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/30912260992.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/56032924909.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/29146223830.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_off0000b4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AE 15696 bytes
SHA-256: 7a521973f11d94ae1e932f204bbf9f7714b878c38e9d6b91e6b70fc1f9bf50bb
font_01_sfnt_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 10508 bytes
SHA-256: 13cd6085f007c72e11b4ecb2b9693184e1ae494a65af178534ff67be488a7659

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