Malicious PDF — malware analysis report

Static analysis result for SHA-256 adab17f0f75fe3dc…

MALICIOUS

PDF

88.1 KB Created: 2021-07-17 19:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e554c2f0833522dbcadbd0ee442e9b9 SHA-1: e1594c04c1c0eb58ac46defb0c1bb1dad6dd15b4 SHA-256: adab17f0f75fe3dc7f9cf543f833b44c8e60c7546b9002e2ddf770b2142c8e6e
204 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing lure. The presence of a 'download button' heuristic and the 'password-protected archive handoff' finding strongly suggest the document is designed to trick users into downloading an encrypted payload. Numerous URLs pointing to compromised CMS uploads and disposable hosting further support this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • 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://aihyang.com/userfiles/file/95623815225.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9aee9b648---tikotigawemakun.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/mutonepirob.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501185410198408.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/dd2ae40eb81100e1117dd77c10657c9b/20295226671.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a77115149f---65383254682.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/102c5cf512e314afc6b45b814a36ddf4/marizob.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/32687e2f9ebd15111039b44f74f526b3/75675696226.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/ridejiwinu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7f3kt6psndne4lo79sekqh4to0/76553356691.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735c7024632---26776983594.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/b338a2d155375240390076a64ebfb21b/vuxibobananowa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vulone.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905b355dfac---11401110353.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b308ae388b8---67731367190.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/52142710887.pdfIn PDF document text
    • http://apcmagon.com/userfiles/goxetuv.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/62314448420.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f011fc0f66---desolodi.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a47f285c51b7ddbf44dbef3514c1d702/sinoxumikolovileri.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d53f67cadca---wizer.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/95452231948.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/fc63b6e5535f94187b12c4718283e9cb/kamirofuwixasas.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076b5e9cc307---24086870278.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/j3qo0kn134puscnqpjbfgbgcq3/81422892617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+remove+permission+password+from+pdf+filePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 10804 bytes
SHA-256: 325c0d245188329bc5df3fd00cf7c486105fa57fd157a7ad1c9924b6d98fe3f3
font_01_sfnt_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 17176 bytes
SHA-256: b8268d10e23f8e00a255c2558ed1f06a8069290c2acc28d160134b0fd12f3db2

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