Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3abb18bbc52fea8…

MALICIOUS

PDF

84.7 KB Created: 2021-07-15 16:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8222886924c5d06e5f60286e01a9d727 SHA-1: 1c118857501e99c2b9543e6025285d09d3803786 SHA-256: d3abb18bbc52fea81d615264e880acca6bdea76f9ecd6c965fad03d458d26bf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://philabc.ru/uplcv?utm_term=signs+of+convulsion+in+babies
    • https://underworldgear.com/upload/users/files/8966275208.pdf
    • https://e-uchebnici.com/img/file/12949025884.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a652efc378717e21b99cde5ab2f388b2/76212978370.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2c79229e9---56985027014.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/8e3e4240bd08137f926ad7694664e851/tifodimifi.pdf
    • https://lapalettedesarts.fr/gestion/file/tegifezirotemelage.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/c578a0735165e5ad1d8b75c61e6be0d2/50462488678.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8091fa83bd8fc2c35f1cf218748a3b13/55773257229.pdf
    • http://dzbnf.com/upload/file///98190247122.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c4614d938d79367eb1f19c75cb75db0f/71750953573.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ee0b8af40836549ba9ccd4220ce37cf8/xukizepuwitapinom.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719a3e1ecc4---xaxokokajuxu.pdf
    • https://mariellatriolo.it/public/file/lisezotuwexonixominijan.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/c4i3c9dtnbe2b6g931ferobv20/53600520202.pdf
    • http://benthanhsgfarm.net/images/uploads/files/zimofabopegowagofen.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/896c15d853b15cd61454c1d5bb9e8620/wijipopusuvonilorax.pdf
    • https://arnetbilgisayar.com/upload/ckfinder/files/56234493301.pdf
    • https://ukmalayalamnews.com/userfiles/file/28174327947.pdf
    • http://dok-vo.ru/userfiles/file/kuxamosetukero.pdf
    • http://alpha-cp.com/userfiles/file/99609404985.pdf
    • http://www.derbysignandgraphics.com/uploads/file/11852226846.pdf
    • http://dgjinhak.kr/DATA/upload/files/202105270206264813.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 16792 bytes
font_01_sfnt_off00010208.bin
b534f473ccbd2e7e6dabfe9a379160b723eb89796fd4fb1690b5f27036c3b5eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 16660 bytes
font_02_sfnt_off00012d1b.bin
1322cdc0d48d896aeeab34cbf26bb4e8210d03cb53b565a5c2327a5d678a1bef
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 10696 bytes