Malicious PDF — malware analysis report

Static analysis result for SHA-256 9447745354c46d09…

MALICIOUS

PDF

73.9 KB Created: 2021-09-12 21:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6cb431ba4ec9aa5e3a584ee46fc93652 SHA-1: 93265e7781f2caf36fd585049a0c1d49b416de1c SHA-256: 9447745354c46d098806468d69c5ff1d8b78e5e59dbbc6b77506c312f26dc08c
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16138324c90c0a---medipiv.pdf In PDF document text
    • http://autoscuolecasetta.it/userfiles/files/nuvomixuxeremifurasez.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/benefonavejo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136204ab3abb---94455062643.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109051233505664.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/81036392746.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/lopak.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/vuxafotet.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0c75c61dd8d398599ec3de351becbc81/texukunonisabavosizuto.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/larerigotax.pdfIn PDF document text
    • https://titishop.co/upload/files/rafovofowila.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357b74441b6---jejitafosevi.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/puxakokofudekufufexim.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/62648237489.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/mebovexuwozuvamef.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/13502709607.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/uj5gi4flginu2e823c4h7eiem8/roxolejulije.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/vitedijidovija.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/31992332145.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/94720643555.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/sajez.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/zirebubeman.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5683eb397bf68109dd19d05cd9102d14/fezatenivirofizenax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=lg+optimus+l3+android+phonePDF 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_off0000bd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD01 11068 bytes
SHA-256: 8dd926d8d0995b8c10c0e08562089fc0456a26c05a458773b8a70563fd9bdad4
font_01_sfnt_off0000d669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD669 16984 bytes
SHA-256: fb6fd6cb9b7ee6f17af6b322374d515714c469bde710150bb40278b21ab3b306
font_02_sfnt_off00010251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1