Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55d91230b615216…

MALICIOUS

PDF

154.0 KB Created: 2021-07-28 07:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 348f25578fbb5e1f6a23a19e51e9bf7d SHA-1: c5b359e6ff9ec6ea11edf437463c25d7484c0998 SHA-256: b55d91230b615216b24f22f0718589714368c46281036e8325b798565fd4709f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm hosted on multiple compromised websites, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure for users to click and download content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/kbr05fb3h24u4vb8tsvrujbcjd/gupexiviruwexin.pdf In PDF document text
    • http://tipiland.net/upload/file/79240383266.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c136848539---gefomamogataj.pdfIn PDF document text
    • https://ckmandarin.com/uploads/tizovomovusifunimano.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/dda114663a83d9df639290d8d2704605/92394413339.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/79775358902.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/7577525980.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021052515253273499.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/63538f0688f3d5458ce48edc84a21286/75612385666.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/wabogefapuwusa.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1fb4bc473---91765818065.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/2e2708825b4036444aa37fe56de919ea/xolaligila.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d189ced496---57977982082.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ec3d71bc---tozaxelozuzeriketubudex.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/75445284415.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d15f8a1213---gumukefowimelopuvefote.pdfIn PDF document text
    • http://zuche0551.com/upload/file/pewexalupafawimid.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/7acea05f2dcb0015d84af5599de84025/63432439969.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ta74a8ubdlgb7elq53tt34kf1n/torutunixeb.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/kanunosikorunodusevowesel.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/68634283126.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/13678926803.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/42274486017.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776a202c170---21540694247.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/18689296537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=jbl+bluetooth+speaker+driver+windows+7+downloadPDF link annotation
    • 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_off0001f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3C7 19208 bytes
SHA-256: d7537f6c154a9c06fb19ea918d9a82e044a222a236469e3c9814f1b6a8055dba
font_01_sfnt_off0002277c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2277C 11012 bytes
SHA-256: b92d91e7a87286a3e6ecdd0d8f7d5b3978103714e20bf13a92ec143141557443
font_02_sfnt_off000240f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x240F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1