Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78c70ae5e967530…

MALICIOUS

PDF

86.9 KB Created: 2021-09-13 13:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22604ce2ca071ca4ca1d2700d55a7c5c SHA-1: 678f3e50f73a4fa2949e4524c4e90b2f80a64bd1 SHA-256: f78c70ae5e967530a28e7f486ca21911fa94f65d7794dece6593a355acef4545
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest redirection to potentially malicious or phishing sites, indicating a spearphishing attachment attack vector. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=best+software+to+create+android+app PDF link annotation
    • http://keifo.ru/ckfinder/userfiles/files/tomusobixuzema.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/lejedamofolelogifozo.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/vadotalifi.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/46871449531.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/36251957576.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/75928285350.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3e36037e0---98063197782.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/vukefetuzujarojeno.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/eacb1c7936be20ec7910313ea82d815b/juzoravezumorosawew.pdfIn PDF document text
    • http://gaudi.tw/upload/files/miperekupavesubapux.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/10234053822.pdfIn PDF document text
    • http://medrea.ru/upload/files/76087472391.pdfIn PDF document text
    • http://vhz.cz/user-files/85767952829.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/birogivoxekijilofudi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613486876c05c---64464371395.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210906053749.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/mumezefimiforaruxoze.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67aef1341---31931981963.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132e661703e3---85670961544.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/86569814783.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/95949961872.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/19707747808.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/wibifupixowu.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318688c4b49---piwobevamewovikexe.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_off0000f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 10708 bytes
SHA-256: dfaacb1576011c906dca4b522dbcc45321c8f8352545ccdcc6ca4e566af4c900
font_01_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 17308 bytes
SHA-256: 225d594370e01dc089ca20e00b519815f9b11f37bc98044544d2b09144636813
font_02_sfnt_off0001359b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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