Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd28af7eb8fadb76…

MALICIOUS

PDF

78.9 KB Created: 2021-09-22 19:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e83a95617c3655c5a4a128b38d526fdb SHA-1: c8e68a779b27386686e4d27841f0d35d1830a8e7 SHA-256: dd28af7eb8fadb76cf4017e14e6a37c019f5e04ee2bb636c11d99423d21f7bf7
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://oniceh.ru/uplcv?utm_term=bhagavad+gita+as+it+is+online+free+download+pdf+in+marathi PDF link annotation
    • http://abbuffalowings.com/uploads/files/zupesasigelawakepojosom.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/paluramaworopatosezip.pdfIn PDF document text
    • https://mauspro.net/upload/files/40907551190.pdfIn PDF document text
    • http://balalajka.nu/media/zegutigizitugejudelopo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/1918023705.pdfIn PDF document text
    • https://salwangurugram.com/files/zodozad.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/xadekimenulatomiwamuteke.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/10928543772.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/risexekemegomimoxupiluza.pdfIn PDF document text
    • https://codecs.ro/images/file/46625659269.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/jenozogegisujodu.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/woxugejesusesakop.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/77301838371.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea7a7a35c1---jakebowop.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/42198178366.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/48145626077.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/vutebif.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/fakuvofivijaretile.pdfIn PDF document text
    • https://naves.cz/res/file/novaruramofimupaxut.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161445e6f3976d---mezawekot.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca68750673---vitenosidaxojesenusov.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/97386900249.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109162219167342.pdfIn PDF document text
    • https://polandpools.com/contents/files/pukofumimuzotogukupifu.pdfIn PDF document text
    • https://tckontrola.hr/files/68697671025.pdfIn PDF document text
    • http://373113.linker.tw/files/dajuxarisefelijonexe.pdfIn PDF document text
    • https://onecre.com/images/content/files/movulawezawolomu.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_off0000c839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC839 11152 bytes
SHA-256: 6ef3b2d9ae15d092ca282fce246acb4fd0a900a029d27fc10da6c5f8845d3217
font_01_sfnt_off0000e1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 19564 bytes
SHA-256: 9535a90c079c73f31dfadd40e543340740fb9c3db5b41afcce46dfbb99245201

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