Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3034ea9bd145e1…

MALICIOUS

PDF

86.8 KB Created: 2021-09-16 23:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5273a64dafff560271caccf29316611 SHA-1: 26892e2da709491573ef0108057ffe9414feeae2 SHA-256: 5e3034ea9bd145e157897023af1192df586a870e39693f718d325621a39d6125
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e615e7e6d7---58153352893.pdf In PDF document text
    • https://mobilieroccasion.fr/uploads/file/zagumanesewuwizexajomob.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/93921448018.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d47509c170---40651913911.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/jibalipumilovewivuvib.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/nupetelaxufad.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090716584543.pdfIn PDF document text
    • http://stroi-sistema.ru/img/12767377361.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/fevofut.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/botareragaka.pdfIn PDF document text
    • http://findacommodity.com/upload/file/radebakobefigarur.pdfIn PDF document text
    • https://agatanorek.com/files/file/puwuvirovovob.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/99940278883.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/30113912422.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/28872269252.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/11922062991.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/pegagugodapizazufofu.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/2281529541.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/pigavapidenizefaluti.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/27851074091.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/93bdcaf827949722cac3a8fa32f732b8/pinunotegikaxekaga.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/zolusap.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/11/kazula.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/kofigosureradanofaraber.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+i+clear+system+storage+on+my+androidPDF 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_off0000eecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 10904 bytes
SHA-256: 821baee47587664b604d6d61ec2c51e6aae7c47d9667f044130835b37866cefe
font_01_sfnt_off000107d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D4 17352 bytes
SHA-256: ac4c2b4ad84ef5d9af0879e1226e63e03cc07aa645462cc40ff70e65a1b68cbd
font_02_sfnt_off00013511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1