Malicious PDF — malware analysis report

Static analysis result for SHA-256 7729b8c04b68349d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 10:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3201ea9bd12af3deb7f00d636bdee510 SHA-1: 7da73b951bd2d3fc10b502fc12b0347f7b71dd6a SHA-256: 7729b8c04b68349dd71128fe68055ddf172385e3df1daedb2f7e42519f730cfa
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://alwaditrading.com/userfiles/files/powasuwizuga.pdf In PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610a7fd58eb7c---64907323810.pdfIn PDF document text
    • http://absigorta.come/file/85926967478.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/senegepobewid.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/95850914173.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/nuninutezegezirit.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/sqctg6jdo6k83mmrd3h06cs7o2/xewenubapuzope.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c5be536e59490e30fee0470ecf6d6c34/31060247387.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/jifuzexoguduto.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/xakegutopakivaxizinotagor.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072e75b28a19---dikavirijutew.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608415a1145c7---18378580672.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/fizisitegifegoloboxun.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e0112ef648---39038174261.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/28581798480.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/97975841427.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/55507152895.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ie26448g13fja6r3fij8esadgb/dorer.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd03196aec7---jelulipijalitufi.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/69519779414.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ddf7dd7d5---7448449221.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/jegukok.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/51657e2cfd392fbafe102888e7597970/juserelax.pdfIn PDF document text
    • https://ekransamara.ru/files/69620083352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=noaa+charts+download+pdfPDF 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_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 19200 bytes
SHA-256: c30fc885303ba49112ce49cbf4af1953c29c9a450395d3d4ac8c44ac8f4aee55
font_02_sfnt_off000129d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D9 10556 bytes
SHA-256: d1ee99f19d5ae727121548e6ebaa19b0b06aa71d40634e003b390a1559bdb856