Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c56a9057b7897f…

MALICIOUS

PDF

208.7 KB Created: 2021-07-15 15:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9113c96ba55186eacada7f1156fd8d3b SHA-1: a1c64d26e5e83faccaa70403e33aef09db8f5762 SHA-256: 82c56a9057b7897feec7aaf7214622727ab147b8c4dd81fb93cddbf985ce0dee
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'download button' heuristic and numerous links pointing to compromised WordPress upload storage suggests a phishing or malware distribution scheme. The document body is heavily obfuscated and does not provide clear textual lures, but the overall structure and heuristic firings point to a phishing attempt to trick users into downloading a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9509

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.
  • 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://primer-spb.ru/files/files/88653608902.pdf In PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/c3891a5aeb8fcf111905789b8fdc3ce4/lupivolutotodizatoxem.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/vvpq26ue7qm4ml2rd9nr2nh08u/kikugotig.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad047e0fc76---buned.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b705d521e86---sizasadasutotogo.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/fde97a0c78b007fb00f551a7c55e3375/58636936027.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/sesugemamu.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4a6395f999ece052cbb4092e346f53a6/76681477759.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ad2f936d2f8---58123924086.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/10d2b0ecb8ec8959185eaa8d78f8888e/jonanegogoji.pdfIn PDF document text
    • http://mp-journal.com/media/file/guwukaj.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4e32c8c0f982d592f77b0c41b5f146a/gazobasujal.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffd419beee---baxidikoxodebefod.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/0mibckfaqimk3t2k92a25cvp26/muriwixofogobilixakila.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/bekogamafujifisimu.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/80844396899.pdfIn PDF document text
    • https://j26clean.com/upload/files/91461392917.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a84bbf328dbccda8e5da446cb270a3a1/direwijimugetafokilenagid.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/31c296fkhugfh89mfd39acrg10/17209821524.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/wuxapotekibuto.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160781c8193949---90485061694.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadcc17df75---57282793424.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/nomerefejosorexujoful.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eefbe0873a---41988875975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mass+flow+to+molar+flowPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002af76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AF76 25148 bytes
SHA-256: cb7bd125c69689431e2584811a0d69687ad00ab1054ef26d666e37dc2835124b
font_01_sfnt_off0002f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F069 10128 bytes
SHA-256: 2357a62104f2ca56da0142cb3f77bd8b092d18080f8462e24c6f4273405d8b36
font_02_sfnt_off00030728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00031f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31F39 16080 bytes
SHA-256: 6ec0a307146d9be2bdd9dd9a35227856c774c3cce985d3f038f6c9b4f02e256a

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