Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ac8623cec7f831…

MALICIOUS

PDF

95.7 KB Created: 2021-08-31 14:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7df7b30b4c8cbbc039e31da5eb114f6b SHA-1: afadf57d2e6f6411a1c39180d7d0f60e5c147816 SHA-256: 45ac8623cec7f83190a2cf417facc1e12b6bbbe59f16a4cbd8601e137ab12be5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.mostenpo.jp/userfiles/files/nevekodawaguto.pdf In PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/topopapigadofarutu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfceb07305---wogapuzos.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/72723921786.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4804bcc0e---89857349482.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/fodagavusogapiwufibaka.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/towipez.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/76652903086.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c779d6ad87c---dapapebagojubowupajaxinaw.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6a78b7a5015d9a8fc582c75e50cfa219/82534141475.pdfIn PDF document text
    • http://skncn.com/u/files/dajirenarumipijesurax.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/nl0opu62hlu7peqs2s7hn9bb57/4266254487.pdfIn PDF document text
    • https://senhewood.com/d/files/jufedatudinulezakol.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d7ce80dc1---verubusipuxe.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a3b4abb22---bapofilapojakopezodab.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/65597348390.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/guwuzalakukuba.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/83890798424.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160739b5dbc1ca---3447731365.pdfIn PDF document text
    • http://adice-area.com/pictures/files/zofolak.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/q7p9diamb5rcfsegfm3lqlkak4/44988627743.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/witexamopemofakinanuni.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/26534024315.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/21900986825.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab92b4abc---jesexubebatuma.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d96117b59d---zumuvelujuzog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=datagram+packet+switching+and+virtual+packet+switchingPDF 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_off00011075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11075 11184 bytes
SHA-256: bc6df6fef10230ef6300654bdd9718863bd9d8d21abff12e922204c5f0d5fab0
font_01_sfnt_off00012a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A54 17688 bytes
SHA-256: 6625830a781c17beb2a965c4175f910d9acf278e82188c4fe607e7b75474e2aa
font_02_sfnt_off000157e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1