Malicious PDF — malware analysis report

Static analysis result for SHA-256 248b9bcdc8e1b571…

MALICIOUS

PDF

85.5 KB Created: 2021-07-18 12:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8d16bc939581d6714b9673ddbfe99af5 SHA-1: 5ac7cd74acf6eaf3f7000691777f95b2a20e8b7f SHA-256: 248b9bcdc8e1b57173a354daa77b26cc92a596ca760389983c58f2ce43eb195f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is unreadable binary data, but the heuristics and URLs clearly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/tevujavesotisamutugolibu.pdf In PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6e8041b16d6a0e801087123b6020aa46/zibiletun.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b270912b2---vofawadowagig.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/fizovinikosidiximariwikor.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/2hha16m9sj9dobv26i928tmpml/44953624053.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ad2a76e61275db419e9022fba386405/gelavoripaxelepowegup.pdfIn PDF document text
    • http://www.eltomillaralhaurin.com/ckfinder/userfiles/files/werowuz.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089450368f96---22865032284.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d941384272---41081778102.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/49199227183.pdfIn PDF document text
    • http://roocenter.ru/upload/file/digokafunezob.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a91b8d4d4a72bc35cf1e5c9590c9e9e3/guwinatexomojudivenibep.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/86399886895.pdfIn PDF document text
    • https://luminex.pl/upload/file/44691000414.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aabe18eb3e---susubebozazedumana.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/3f0e3d3756a64186c5b939dc2822e318/22753606245.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/j8q77sqd6mfru755je6cna81a2/xuzitolosizubidepugojama.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/77285723052.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c75324a21f4---70731985193.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6a3e5800939e08e9cdb098dd23c05fa8/11093668835.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210619055912_vnmoro.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/5e19eeafcbe221f9c0f389f734856dea/49943833477.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/7564038315.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/imr9nj9dh2ilqtbn51b5s03j28/wazevowuvakugororulalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+far+point+of+a+normal+eye+isPDF 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_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 17764 bytes
SHA-256: 89a2daac317648893aaf719841766ac7ecfe122f4ee5be46eac3f74e7b865141
font_01_sfnt_off00011872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11872 10700 bytes
SHA-256: 7ed9073a11650a7e0546f45fc554a8ee921e4e691efbc0f0612c512f8c0b9afe
font_02_sfnt_off000130d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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