Malicious PDF — malware analysis report

Static analysis result for SHA-256 390ee2a6fedfdd69…

MALICIOUS

PDF

90.0 KB Created: 2021-08-29 20:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4eba33f24443e665fc55943be6e55160 SHA-1: e55b2ed69f6ddcb72074926a463d6cbb7cf9c0bb SHA-256: 390ee2a6fedfdd699dec3aa611bb6f2c5631afa685494b88f4db4a4caf1f50be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely lead to further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec76ad6e77---xenabibim.pdf In PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/dejivuvemadokefulasodav.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160734bf0e0b09---94927156845.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a53c966e9dc---kakarez.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/55608804489.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/turat.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/66235717537.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/29792404632.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/73411ba6bd256a5c2eeb97e8013e1758/7992496186.pdfIn PDF document text
    • https://okvino.it/file/wuxowepewazetozirawomu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ce074a7a---relir.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/606tlb0b01qsd89ke4um3852i4/7781927366.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fa2ffde6139---wolutoz.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/mumoroje.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/xujog.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/xunatiwoxozowenuxexobivol.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a2fb22442b184d8b5b0677e31bea69e4/61611165985.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3f8df8a8e1f7dc653c32c603328ac676/pojekitivibegowosid.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/39061885761.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df3fc905625---lolazoroziram.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/vexitopagag.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/wuvef.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/nuborefijoveve.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/falinajevomi.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/finawutekevag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=classic+wow+fire+specPDF 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_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 10388 bytes
SHA-256: f6e742e2ad589a1e25e2937411ffb5455981f4dd3cc8c3673d3634fb73e6b262
font_01_sfnt_off00011428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 17744 bytes
SHA-256: d82f26495a71d6cc207cf6fa769c90745b270dc969991273292a893cd0cf9376
font_02_sfnt_off0001417e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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