Malicious PDF — malware analysis report

Static analysis result for SHA-256 492484a5621d5021…

MALICIOUS

PDF

94.7 KB Created: 2021-08-16 04:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a13fa368b9684393c1c82375d033945b SHA-1: be55fa7d3d51bbbdebfc80e7e9076c591798833b SHA-256: 492484a5621d50215b7a1d6d008021ea73e837ba1789f8ae27fa0d3878d0a16f
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to host malicious files, specifically targeting users looking for password unlockers or cracks. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document is a pretext for delivering a password-protected archive, a common tactic to bypass security filters. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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.
  • 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 http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160af3b42b9fa3---zamuwixidigagetubejeweb.pdf In PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/xolomavefiw.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f531da41---jetarobidugodugobogo.pdfIn PDF document text
    • http://stattus.com/assets/file/tomufo.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/31461035061.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/70052968017.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/98231522662.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/44101473842.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/talegavakominu.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a24b31e75---jozanigebixajugepulam.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/sasobodivibujajudamom.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/7t10ioem2s550hhvino2n2umc8/31651259748.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/61168150604.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce8382f5f4---1624746825.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/04b8611769d68e52a2074ef7b926feeb/jesujarajefofabojafuf.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/fidilenafole.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/zipuzanijofaz.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f9590f6169f52beb0a7dde14511b3e32/79585093069.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608857ac067d7---mafitij.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/36361394464.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/tugodenozokiwekapipuj.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607113bb00eb7---kunalufopawoxitapufiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=rar+password+unlocker+crack+full+versionPDF 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
stream_005_off00014a48.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14A48 19960 bytes
SHA-256: 772582116beff27917936ae4ef02ca35631df189458d772e7d84407e4c1050b2
font_00_sfnt_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 10904 bytes
SHA-256: 2539922d43b15ce98c56431218482ed2b84938ac6ebfb9a6895fe436465acfc5
font_01_sfnt_off0000fb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11394 24800 bytes
SHA-256: 7c34ecc87b6eec40085a1631c9d8bca048780c9835f319a7ecc336343236b208

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