Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0958b36fb30da7…

MALICIOUS

PDF

78.0 KB Created: 2021-09-20 06:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9f7efb1178ab041dc24a107ccf775109 SHA-1: 934ae4a2bd32e5d8f9d3a0d469cdcf5b92e322f8 SHA-256: 1e0958b36fb30da702c3f7bdba7543a4096b2178dc12ce293a5eac84fa51aef3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, ultimately redirecting to a download lure for 'gta 5 highly compressed for android'. The presence of these links suggests the document's primary purpose is to trick users into visiting malicious sites, likely to download further malware or engage in phishing. No scripts were extracted, but the PDF structure and URL analysis strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://allytemp.ru/uplcv?utm_term=gta+5+highly+compressed+for+android+download PDF link annotation
    • http://alimentosldm.com/userfiles/file/fowebed.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/gegumekakemiwugub.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/40712425886.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c6eb75c2f---6812318513.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/48131578530.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/tejozuv.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/dufenexoxelawenonusi.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/20435350751.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090715590119.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/goruvenunavixiw.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/5e47fadc78da70d8b97c072358b55fb2/14081891217.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/pufuzilupuxomivetugi.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/nujos.pdfIn PDF document text
    • https://micsys.in/userfiles/file/lifudajuxozuzufoten.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/rigapu.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/mokavovo.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143b8dfdbaff---17496987800.pdfIn PDF document text
    • http://friulanapanini.com/images/file/masolidakexuwa.pdfIn PDF document text
    • http://arsvet.ru/img/upload/papukuguvenebiwom.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/18243607774.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/27083389708.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/zidafojevudoja.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614586a66fd22---32030117289.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/82383479662.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/14799725129.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_off0000ca8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A0 17144 bytes
SHA-256: b81893ffb10a9074e797788c517f19ef716dd5ff675a4b591ff7d1258658422c
font_02_sfnt_off00010f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 11440 bytes
SHA-256: 633f54e86ff3e7b3cba7605e2e17111f3c5fdb2f7a310d51f9ad400e98f138ad

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