Malicious PDF — malware analysis report

Static analysis result for SHA-256 201dc6637e434d6b…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 17:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56c2228eff896cc9c6bbce52b12c1c4d SHA-1: c5897d93a9564c56af42906cb4816f1ad71fe4f3 SHA-256: 201dc6637e434d6bce69f93ad67cc825d51042eb90b37da90902bd69ec17b227
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure victims to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://allytemp.ru/uplcv?utm_term=strategic+planning+pdf+ebook PDF link annotation
    • http://yuha.be/_files/file/zigito.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/96649958148.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4da6a7725---84695667821.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7a3492b0f6d6afcd2d06e919e6970d6a/65915850717.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608385e343ad9---fujowivesiwed.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1b7061c2e---kejudutazasimarezakoxo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1611d1e2c2c654---tewomaxomozivepaguse.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/31142359369.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ts6lhgoun34eodbmd64li004i0/kepoderajobexe.pdfIn PDF document text
    • http://atraba-holding.com/userfiles/file/volovurubipezetat.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0abdb458a3---suravexaz.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/buzosovomovopiruvomidadu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3da6e4f343---pizojubabowojefosadi.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ohjkl9vc2vsosdm0fc2o3eb2mv/26346332814.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/bunolajiruvar.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa25943826---wuduluxabitabim.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3267d7024c---kusezuz.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/jiziluredevu.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/gusuberulumubufaxamober.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/julikalezulolugegu.pdfIn PDF document text
    • http://17njl.com/userfiles/files/difokefewenimokulubo.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/o5vo0ki52lb1622mbgvlci27ma/65375088632.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c49bddd0d81---28717839608.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764ff07268a---jipuvodaxitokomegavovewu.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/17888905006.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b8e24e82---dewepu.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/60296403426.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_off0000c25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25E 10936 bytes
SHA-256: 7113429d8fa087ad57e931b5216936d2d01c3b43a7d92af3780a187d607990a4
font_01_sfnt_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 16420 bytes
SHA-256: 733a8ad23ba2b038507907655be3a67ce89f17934af3ffccd2f40572ad9065bf
font_02_sfnt_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1