Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a8335da4432be3…

MALICIOUS

PDF

82.9 KB Created: 2021-09-24 10:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e5ff53ef37342b94faf9119c26f2150 SHA-1: 3612b99f8fd33899452c9a97dd0aff80ff73c482 SHA-256: e3a8335da4432be3b8b9af2a9e4df974ee2da8f49a6b4d929ab81374ba4c41fa
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm hosted on disposable domains. The presence of a 'download button' lure and numerous external URIs suggests an attempt to trick the user into downloading a secondary payload. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=launcherpro+plus+unlocker+apk PDF link annotation
    • http://mrpennarak.com/user_file/file/82285877000.pdfIn PDF document text
    • https://best-label.com/upload/files/xalonizijimuzev.pdfIn PDF document text
    • http://bptramptour.pl/files/file/41424804870.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210903_163507.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/4363621493.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614a4382c34e8---66695643685.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/91316786394.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/morunidajibirimirexovur.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/37736775195.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/disefemululebafe.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/jabigosipavokatazasedox.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/59652457513.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/jujavuguzev.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/12667790864.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/40500473957.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130a5970120a---24666217552.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/fususuzil.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/11146055809.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/lanizufimepimomegap.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202199205499901.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161365b4aaeb18---23495251055.pdfIn PDF document text
    • http://muszempilla.com/files/file/zutozu.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/77978431800.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/petejinorutezop.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/patomoxifeku.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_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 10428 bytes
SHA-256: 23c5745f9c1897eeacd4ab11f01f450fc1d98b42a5ff0b36840978d2fe9d082b
font_01_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 20020 bytes
SHA-256: 8ecb6d982a31eeaf92e3cbec193bf680b246a73d48586ba7dea770547627f2d3
font_02_sfnt_off0001259e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1