Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c8ae4b08038a01…

MALICIOUS

PDF

87.7 KB Created: 2021-07-30 12:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5b9fc1aa503710b6baa6669b8c3a915 SHA-1: 3b3471b5fbc1493e0d8e128abc1b75cd95b7a682 SHA-256: 94c8ae4b08038a017954e80385871531eadf31ad16f2f24014b3a989e81ff7a7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites, specifically targeting upload directories, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc8c59c34---xobarabakidifisamaz.pdf In PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/fep9abseh9ekrncikf9dsu4m7m/92064384275.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/80a10279b1f5c13361a6b1cc144b4bda/18011169250.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/34278046429.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/kekivelitowolojofadoje.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/bizevevalijopesat.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b07534369---44607283914.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/16ae7623a273423b18439f97a8d92217/14295856056.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f8536959c37---fenugule.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/65061199033.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/skrgus1te2s6665mr4ju0316ld/fivopotoruxajirukilivupu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba014f27e6e---xubixer.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/52097898706.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/62585973887.pdfIn PDF document text
    • http://citranco.com/users/files/94538503520.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/guxijebujufajuwa.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/kalas.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c69c25c7142---85488712907.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d18b780f6---4232563642.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc49a4ad8a1---90991199549.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103bdc69b771---lirokobunuzuzuwiwezi.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081c3743d481---28059850475.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/wimiro.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/puxuwe.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916c7739902---selutubowixarixumaguniwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=modele+de+lettre+de+demande+d%27audience+%C3%A0+un+premier+ministrePDF 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_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 18812 bytes
SHA-256: efac63510823d6a05effd3412a9fece2634f450d07a7ae42f7c98071fada2540
font_01_sfnt_off00011bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13412 10984 bytes
SHA-256: d02308335199a34179f270abafc6cde3612e3bad76a9ad2e33f583295705d6c5