Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4350aad1e78a6ef…

MALICIOUS

PDF

90.1 KB Created: 2021-09-16 09:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 122b710de0418c0935a5c1e98ee33624 SHA-1: 23b30c6fecb0507cd7bcc63bca30df87a64c6be6 SHA-256: e4350aad1e78a6ef1ee18e0b07f49031d6ca9da91e9a591d845bf9d4b589fbd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=how+to+get+free+money+on+jailbreak PDF link annotation
    • https://ateliersmq.com/pevron/www/img/file/53996699929.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/tidoladirivomuwelojuviwe.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/xizedevodedelafokagop.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/4851329420.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/zogapofobunaguzaro.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/222911a348f5cc436c7cdd9b1270ed73/lunikegovimokisovar.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/lunodazaxiziwadilagalobe.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/mumuwitubol.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/dopubuxeribagapabuniso.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/15071110383.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdaa21448e---fedajewatogawawugof.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///gibuwudadafatuzefowunez.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142d0644a139---norerizofaluxofufofode.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/74629320309.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/7759594757.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/kalemanid.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/79480053344.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/68175186471.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/kutevunuveluwuxufirodug.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/97032950974.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/31568057791.pdfIn PDF document text
    • https://thehouseproduction.net/file/midirapebovidalezurataz.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/wofejumoje.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_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FC 10940 bytes
SHA-256: 0f1883f1ccd7455ec14a32125c32ed4f379d129c3bb9f9e23b3181fca968341b
font_02_sfnt_off00012b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B53 18484 bytes
SHA-256: cb011bb222aad51d8cf03526842b7e66e3e617350e9b22fbd9b065e5504581f5