Malicious PDF — malware analysis report

Static analysis result for SHA-256 30d33effb3eb3cfe…

MALICIOUS

PDF

98.4 KB Created: 2021-07-06 23:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6289695f4427185a38289853ddf70a2e SHA-1: c7f9488f04d4b064944f37c44b269a6e5ff93c12 SHA-256: 30d33effb3eb3cfefadc9f48c66e8b4c3662c8bcac44240f21c5f68df267e1c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of embedded JavaScript, though not directly executed in this static analysis, is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9374

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=anticipatory+breach+meaning PDF link annotation
    • https://imahima.xyz/js/ckfinder/userfiles/files/85247051994.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/11381384436.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/220310347fa023f01f1835234d90321f/werutefozatitanikemiz.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22c2de530---37596110802.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/gebano.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/oh64tuq0bgdbcurrar0kmfmm1b/gizoradobureb.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab102bb805---ladowitalozibupab.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3c9f18bcc---94531199393.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/moruke.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2112dde473c8ebbc724abd2ca28c9d3a/xalufek.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c34e0c5dd6a---24257517631.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/45619140757.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/wumatuwotiniburenesomuxas.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/bomufen.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/pakotopewabuwu.pdfIn PDF document text
    • http://minerva-collection.net/files/files/69353118144.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5532e3c46---wujitoxegevufab.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4d2e5e53568ebed678bfbaeab3c4932a/41643067689.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/napibadut.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/basojegowamejolobok.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/62635033413.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/eff6093efe4e96d86944dd5d1a8cdd52/67187037433.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082ff70489d6---93829282364.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/38180252412.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-10/20210510072104255908.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e9d2e4bdec86e6f97edbd1f28a9b1972/tiruralumedomejezafidaki.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015fcf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15FCF 17360 bytes
SHA-256: 6e71aea90d09dbc2e74da8e075b3e9b72f23ebb5059cf3c3680da8dab7e8c758
font_00_sfnt_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10430 3012 bytes
SHA-256: b9e1b5c33c5b7c45e007f22ea58cdee05b46fc6e2b71e9fc084fae554500fef2
font_02_sfnt_off00011059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 22784 bytes
SHA-256: daeea7b1f2cea39f0bac54a19da153340055b7e04897a9c78de2c1435e071b9a
font_03_sfnt_off00014721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14721 10840 bytes
SHA-256: 6152c90eafcb5d0baeb26c5d155d8f61f93a8b616f2d7a0712b359713d459c21

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