Malicious PDF — malware analysis report

Static analysis result for SHA-256 22368030b611c866…

MALICIOUS

PDF

89.6 KB Created: 2021-10-17 18:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6e020f047de0c4c7feed9c51c195ba1b SHA-1: d7151f4ba5eab3cb4c8ff6348c4122de462c18ec SHA-256: 22368030b611c8660be8b3928c53aaf2a3cb6ebf54b651bff893f994354643d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=do+cockroaches+stink PDF link annotation
    • http://carszana.com/image/upload/File/42138964493.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/mobivaxip.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d01b8f3544---gejorujinuzuxudezilo.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/rilezezemanes.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/17954082218.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/81810008375.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/riritegufipametaxerosaf.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/2870424198.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/movemorizojova.pdfIn PDF document text
    • http://montesantangelo.it/files/files/jotolageg.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/patobuligeti.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/11932329170.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/movunogupixiw.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/f3cc9upniir0g6k0km3qm7kd9k/38023423105.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/bunononudon.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/pijejovedizabulubabo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616543b9c21dc---kinididiru.pdfIn PDF document text
    • https://aedwea.com/upload/foto/fuluridadij.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/vunewotululomekirikeruj.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/sifaninos.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/xazun.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/bofujutivajazuxato.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/32232786222.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0e20ad792ff6c5e8c75e524187e656b2/majadadozigiruriwux.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/tokatux.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_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 18048 bytes
SHA-256: 0da7074d22b73053ed1b40563b69dcdff60f03c354753f8e49af9e008ae13424
font_02_sfnt_off0001411c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411C 10376 bytes
SHA-256: ba73982788e340635712bbef5566fa939869bda7db6f2d461805a4c1893dee92

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