Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb7443ca86102b7…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 04:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b91532b306e80225713f64f11a58b2d SHA-1: b765fc7e041f1a96b3db7ba7abcf86a5c47979f2 SHA-256: 5fb7443ca86102b731784a1eac60318af6494476fd1c7c300cafb91e4373d431
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to direct users to potentially malicious sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

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 https://smidgel.ru/uplcv?utm_term=conjuring+2+stream+online PDF link annotation
    • https://myarchitect.es/ckfinder/userfiles/files/53298640761.pdfIn PDF document text
    • http://esen.life/userfiles/file/82752820624.pdfIn PDF document text
    • http://getdol.com/page_data/file/manusawepar.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/bezejofudone.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613291cb4d806---174502380.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/vovawagavabakararota.pdfIn PDF document text
    • http://samtle.net/ckupload/files/84152104586.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/36549550795.pdfIn PDF document text
    • http://cocoal.com/uploads/file/besatejigadugenu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348cc351093---20384521983.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/53726893428.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/tojoju.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/36848063140.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/76221732405.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/50782221594.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/davogolamosefizujos.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/javajab.pdfIn PDF document text
    • https://quizai.com/uploads/files/71124841003.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/vonepitute.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/wokolozepu.pdfIn PDF document text
    • http://fnathservices.com/upload/file/89984685247.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/42ae1322c65ad8e71ababb01da7ba216/22989079847.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/81445209776.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_off0000d686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD686 17264 bytes
SHA-256: faf21a3f5c5144d9b74641cf3cb5c0b2dbfd63c202600a9d100b31e8b8dd796d
font_01_sfnt_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA3 10832 bytes
SHA-256: ed778e177d0ca3f356625680a3357cb07f52547c67523ea1104a3669bdaa1347