Malicious PDF — malware analysis report

Static analysis result for SHA-256 e831809ffdbea79d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 06:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2cf7d8fc493e06ede006540d5f680f0d SHA-1: 430c69ea1440f501e920c11607979a3ffb3133d3 SHA-256: e831809ffdbea79dea867fd4f66938333a804521e8d9ab844b8b6dc211861636
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to link farms hosted on disposable domains, a common tactic for phishing and malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method used to bypass gateway security. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crysiq.ru/uplcv?utm_term=how+to+unlock+samsung+s7+edge+without+password PDF link annotation
    • http://krukewittfarms.com/userfiles/file/ladez.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/pipuxafujugi.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/jimizotajita.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/jejazenaxigedafilonivix.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///sasadale.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/85044893830.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135f4fd9f2c7---22335498213.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/bedur.pdfIn PDF document text
    • http://drironcat.com/images/file/difeludimit.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/32783350599.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/fixirete.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/zivomamaja.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/23124000376.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/70569273228.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/99012716773.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/44870303539.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/3e832b45e2aa1b5107a5a3cdf843a264/dunimepamomerirubodile.pdfIn PDF document text
    • http://abwessex.com/uploads/files/vagotasejovopimomudez.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210914033238417.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/57920782779.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317eae6d540---dipuzu.pdfIn PDF document text
    • https://masihpt2.com/contents/files/5589831712.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/95563735368.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/vitusobuxeno.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/zawakafeguromumo.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/lerowu.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_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 11280 bytes
SHA-256: 4fa7abc241d14636450bf9d45f2806b5fcb3cdeea02b4ee192710a361f7f010b
font_01_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 17500 bytes
SHA-256: a40d654e6e02a305d849344147139362dfab9f0bcdd0789c4993a892bfdb3107
font_02_sfnt_off00011f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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