Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9b2aa0374a311a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 20:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: abc2a7ce85d752f239859e07f354e39c SHA-1: b87213d0b7e3110d53c33c0684ba97f73d953378 SHA-256: 7f9b2aa0374a311abe58881314f90ab5e4a85d56290d59b44569273eac827561
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. While no scripts were directly extracted, the structure and URL patterns indicate a potential phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143c6a26fc4c---fumagewobotidejovisor.pdf In PDF document text
    • http://tajeer.co/userfiles/file/bubekinifoduruzixakevo.pdfIn PDF document text
    • http://4bx.pl/public/file/dubevupuvedazaf.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/fibudataxijuz.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-1/20210901094954381120.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/37564763406.pdfIn PDF document text
    • http://atek-ent.com/upload/file/62233776768.pdfIn PDF document text
    • http://domuran.pl/files/file/24435876409.pdfIn PDF document text
    • https://davaocarrental.com/images/file/19005529942.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/61673722505.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f688c5d7---nanigolikumasomofejiximo.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1631324642ba03f1aedc8db12cdb9.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/suronurixekotumegamoxuge.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/75917443638.pdfIn PDF document text
    • http://ibb-online.ru/f/file/tibogonugewuwafox.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/jasitekeradod.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/niwavag.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/bonajuxoda.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109161104543965.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/remosa.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/pomuxokifomemi.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/87665156804.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/bee89f1b8ed664c5b9731014ba5cd4fa/89724595224.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/dojelemuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tekken+5+apk+file+downloadPDF 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_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 10400 bytes
SHA-256: f8988b5de9da0a102d6bd1924caf0e88367f1f0f37c95e39c73c2e3720790329
font_01_sfnt_off0000f0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 17420 bytes
SHA-256: 6c881850ce321ac805e759a75eb62d65b3caac69a6630a5fe622a028aa7a083e
font_02_sfnt_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1