Malicious PDF — malware analysis report

Static analysis result for SHA-256 551efe555dab111d…

MALICIOUS

PDF

247.7 KB Created: 2021-06-26 16:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de15d6853ce3912a1553f73acb38658c SHA-1: b7adf0d2e3b4a61f133cd61aa595ab93efaacaf7 SHA-256: 551efe555dab111de01cd575c035d82bf8ecbaa4684b0219640a4bb08b7c4fe5
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of an advance-fee scam, presenting itself as an invoice or parcel delivery notification. It contains multiple URLs pointing to compromised WordPress sites, likely serving as download locations for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=write+off+report
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cccee08af7---xagetotidotipeko.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/3c7d93da9e54ab7ada0ef460e5018503/76364696935.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8288c3ec506353e7c0ccc50afc9bf81c/vuguwewiv.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/f7nhg8rfpvrpm4lsnuiv0ket4g/5920297079.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97b5a502ab---dafuvujuroselobupevowu.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b49481a853b---86353252342.pdf
    • https://nabijdefossa.nl/upload/files/vokamunopezav.pdf
    • http://anandamsanyal.com/userfiles/file/1259323367.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/34hr0j5dd4j92uk588qv7p3ag7/wodoxilebumezisubudalilu.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088236828b59---88061944076.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/77c558ab23d1fabca0101c216f3593a9/95125981103.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814744714d4---7608485187.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087894208d4d---90339753993.pdf
    • http://nacyc.jp/Upload/file/tefivutodonatow.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/14a4c5b5d61eb8f21337d9e1707e0dcc/8597067955.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092011579b93---82163427680.pdf
    • http://yossy.biz/userfiles/file/desipodad.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/90d18d9ef1187dd0a713f9f9752feb13/84439877943.pdf
    • https://qpshouse.com/upload/image/file/16756994630.pdf
    • https://danielstrehlau.com/userfiles/file/gunukuf.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160866973e102b---90985494387.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607097e413db7---xijupawamepeforatusel.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15f6a9b967---sarakoseluvelobujokojuruf.pdf
    • http://driscollandgibson.com/images/edit_images/file/rowesimepinuwesetu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00037384.bin
16d19c5a6da2a0a81a5bd873eaafafab9c9d3f1badfc1f94d4afa226bdac6279
pdf-font-stream PDF embedded font (sfnt) at offset 0x37384 9864 bytes
font_01_sfnt_off00038959.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x38959 16792 bytes
font_02_sfnt_off0003a16b.bin
af99ce78cd132f51bc00f4c73b13eb089e4d532a228ebf516ad09c8153b9c258
pdf-font-stream PDF embedded font (sfnt) at offset 0x3A16B 18016 bytes