Malicious PDF — malware analysis report

Static analysis result for SHA-256 915aaeaca4b0c6a8…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 03:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 46b6c7e1e57f82d7f8f7c607b299edd5 SHA-1: f25128f01e5ca783f30e7931a41e539a48c9ebb1 SHA-256: 915aaeaca4b0c6a895ea3aa855d3383c2c5c711c49658a4bfd3000ec933500fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on compromised websites or disposable domains. The presence of external URIs and the overall structure suggest it is designed to lure users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://coretry.ru/uplcv?utm_term=help+a+student PDF link annotation
    • http://aksaaydinlatma.com/img/editor/image/file/kedoleve.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/97004270691.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/59496512024.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/kabomosifovoxuxob.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/42576692635.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/f7dfd05a688806a5585758dabbd29620/jusinagepovunivusepidi.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/garitesakaziputinegunena.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36bf3817d6---gibanudeput.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/bikusope.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/95qrtanukisb982fqik516urpc/65646693089.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/65406356843.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24887d705---13237936995.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8o17sqctchbj6s36rtdvp9t1n4/11878559401.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/21/18250244119.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d4a944426---9006144947.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f5e01c79f---72242765738.pdfIn PDF document text
    • http://boldogelet.hu/media/bowuwotosuweb.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a826a882c14---murerawo.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160742ce845ed4---91074594644.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/kokedawudokili.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb1c8f2484---68014037671.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/97257151145.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/65f70e8166cb6b15bb02e0a7b4a19fdc/75112459536.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_off0000c735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC735 10164 bytes
SHA-256: a85d9c20ebe090d1f49ca06cbea021615478cfb607b2a8fca488c1b0e2ebff27
font_01_sfnt_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 16012 bytes
SHA-256: 459a5066679c5e5ffc92a35c7345dbd60a1bd65e5fa254754fe83f5d08d8f29e
font_02_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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