Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae5a921535fcf3d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 23:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8a732868c774178f7eb89c62f04a7b93 SHA-1: d21ffc0b9a855ccd0fa9fb91d05beb4ad4dd8442 SHA-256: 8ae5a921535fcf3dc39028dbef5762105beb5185efdaef1facb993477abd8500
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it is designed to redirect users to malicious content.

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 https://laborke.ru/uplcv?utm_term=rotate+image+on+android PDF link annotation
    • http://tecresconsolidamentorestauro.it/fck_data/file/gebawuvu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf4a07866c---60779497172.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/86565138874.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/33173174770.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132f14e79276---36770627899.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614483ca606e9---laxamiwarunegusasufivowab.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ll9eeebada8hl7kqbi9u48r54/37679009927.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/93736027988.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/40809684031.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/15154494828.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/vipobasowaxebitibex.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/puzudum.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/lubulavogujavunolekerusum.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/fegawebedega.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba2e1c4164---44249581986.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/dafuworepepujojeza.pdfIn PDF document text
    • http://pedraferro.com/files/files/kalarobafulokiwanar.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/46194065706.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee6f698095---pivusipuwajisirigevo.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/vakabijuxerolexof.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109132149238977.pdfIn PDF document text
    • http://labsshop.com/d/files/22400056467.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/52280157700.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/nidigunilit.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_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 17168 bytes
SHA-256: 1372b5cb1d2d9ee6eb7e2f171785b91f3c2f844a76b84d150f6085ea5d848cc9
font_02_sfnt_off000124ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CE 10420 bytes
SHA-256: 63e92ef0c8656ac35f25aa1fb293433d2b78184d1883e29443bd9afad5e688cc

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