Malicious PDF — malware analysis report

Static analysis result for SHA-256 818a6e481465067f…

MALICIOUS

PDF

78.4 KB Created: 2021-09-02 01:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11f37ebef50bb32f35c63a81a47cbbe7 SHA-1: b124790ae73999ab83da774d1d13c73819c3e4e4 SHA-256: 818a6e481465067f56f20e9b844db362e134f1ff94bd353a1ca5d71177e83f2c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://laborke.ru/uplcv?utm_term=how+to+train+kitten+to+poop+outside PDF link annotation
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/305a9e0dc5ae83545d3fbe9682173a4c/7311224378.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/37733b500f29851404eaf92447aabe82/80112060559.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/totusepowalurazupexo.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/lugal.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/54548663941.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/dakifomi.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/jidawekotavatavananiva.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607698dca18de---zozixaxiwuweniwifetuzutuv.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/tikekujisodaxakuvekovopek.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/bizosudadojigegumiduganud.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/givukewuke.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/wopobalep.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/jusarakalaxarajigareji.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bb50eedfe---89567660823.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812493b4e37---58920556047.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/2628791116.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/69290740407.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/xadaxiwarusiravib.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/temigimiviv.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/qhelehtmu5imne69oui2cu31t3/29523839954.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/82455065038.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_off0000d072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD072 10608 bytes
SHA-256: caf5e80321c4dc60959efbb32f4ba95639236cec8e4e157462d78dfa1bc7c54b
font_01_sfnt_off0000e8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CE 16728 bytes
SHA-256: 0069d1a86725a92df0c3337d02cfe5ab136e16adf552a5af3f9e5453879d62a7
font_02_sfnt_off000113c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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