Malicious PDF — malware analysis report

Static analysis result for SHA-256 df630bfa78e04a1b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 09:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64a8bfd8fe7ec51e216f44429a6422f2 SHA-1: c1fc0673eb0f46fc752d21578bfe69f70763ca43 SHA-256: df630bfa78e04a1b1b51247d6e430bb86329afd72dcd14ef7fc659f82bbac9b9
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading a secondary payload disguised as a legitimate file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=magisk+beta+apk PDF link annotation
    • https://sklepbonus.pl/userfiles/file/34608619645.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/vitifo.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/pimonujadagogegojomer.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/tumarepinowakelasiwikut.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/gemoxivu.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/pojunar.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/tibuxobewop.pdfIn PDF document text
    • https://petala.gr/userfiles/file/mofamosasolufilure.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/bafinedisalegufun.pdfIn PDF document text
    • http://selidbe-beograd.info/files/monuwivirul.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/91922044579.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/kegizajimewemopuvoso.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/xugefipilaf.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/jonubevazajibivazelenawak.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613977805e51c---10797423857.pdfIn PDF document text
    • http://rapet.hu/files/xobiwositotigamefaseka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351305cc7c7---kuvekumivagunavotigaz.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/10195985266.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d948108f3947477ee544210f8b86ab3d/21928334686.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/nusagolirebonikotolisa.pdfIn PDF document text
    • http://knipia.com/userfiles/file/77969671984.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161353a579d8e0---16260134923.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/piloge.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210903235801552.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_off0000daf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF4 10284 bytes
SHA-256: 8c7de0686563e7c6e6297a40fabdf82f6577ac1eceab99de7df0a0a32c570a31
font_01_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 20424 bytes
SHA-256: 8a8ff068a1b1da990e1a90cf45902ab906c56c632d75f7849aa3ea73b50d087b

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