Malicious PDF — malware analysis report

Static analysis result for SHA-256 c514bd283edabab6…

MALICIOUS

PDF

86.8 KB Created: 2021-09-23 17:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b732f2ccafb991938c96c79364cb5be SHA-1: 98b3d33f163a74cfc61dfbe2ef7cae5fddd0225e SHA-256: c514bd283edabab6efa6d5bcb69c16765ce40e9d870d088c25a47364cfeaeb85
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and is flagged by ClamAV as a phishing trojan. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. The ML classifier also strongly suggests maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=sky+email+server+settings+android PDF link annotation
    • http://pevak.info/UserFiles/File/madexinebapelesiluvezabad.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/99132868204.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/tokopibezixemotorirubu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/48d4101b47acb6045d6620fe4827b267/nofefeg.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/75002207644.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161384f91312e3---35372201830.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/78977462997.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210910190400.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/zakomudewotelisad.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/50428959911.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/371844628.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/sonesisefejerukugurufo.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/46181341710.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/38626940346.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147fc0171742---1854044035.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/055f9fd277228113cfc2170b8c8570da/41789311865.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/mokas.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/36363890946.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-23/20210923002937675953.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219191025202320.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/40308456127.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/wikowe.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/sawenevafozewibu.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_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 18280 bytes
SHA-256: ab826fc2bb70444fbf79ab2c2aa65655340bc1ebb07af5615a3c488153986b72
font_02_sfnt_off000134ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AE 10940 bytes
SHA-256: 8aa49075487a425707f1de6d11b76b85ac4fa3739e21e79b3a1441a7141d645c

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