Malicious PDF — malware analysis report

Static analysis result for SHA-256 94161833571dc2a4…

MALICIOUS

PDF

86.7 KB Created: 2021-08-22 01:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd23962b676145af21e44dd8d52bdd2a SHA-1: 06773960e391cfa21062ac6dd08f0a5bb5cdbf76 SHA-256: 94161833571dc2a41930d1ee6b57d1445c6fdb19a27617afd68af5ea9d4ea6af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further indicates a deliberate attempt to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=%C2%BFqu%C3%A9+pasa+si+dejo+de+tomar+el+medicamento+para+la+tiroides PDF link annotation
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22687892779.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/23585390710.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/bonagevonesezoxudaj.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/gavalopogap.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/xaborobozuxipelijim.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/29742036196.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/44750854551.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608631dfe2cfe---87409174600.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f37755853---talelidebaninewunelo.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070407f7b2c8---digipige.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/mokaje.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/666ef35bc82af172a9b16c93dd3c79ce/sedodesudapewezodulejuzog.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b755ceb9ae1---zawul.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/65682286425.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722d7876b8a---8023442890.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/28339305031.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/4575a84489160ed69bc8a0f4ccda93cd/53554657385.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3fe7ac440857e07a5b5a4bcc69bbdc78/nenanorigadodapenunukam.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afbee146c8e---88527931579.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/fedorumufapujarokuzozolim.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f9816adf0d2---gurak.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/224g0g760bt2b924dvc7ci6hmn/68377479045.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/mulowuzufijewot.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_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 11260 bytes
SHA-256: e86dc5c54729fceb23047a155df643f0d58a8db578c9efdac96e50e3d50177b6
font_01_sfnt_off00010534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10534 17680 bytes
SHA-256: e65b4c72729091420225c313cb4e59e083dfa4cc68844ca80bc2acacc76ec249
font_02_sfnt_off0001321c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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