Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd6f424e3f2080d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 19:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75440d1357617aa37aaed50e6e5e6aed SHA-1: 536b53386a772656cea81721f46693befcc02a0c SHA-256: 3dd6f424e3f2080d8eba73fab11d8b1a73ab6b3fbe546ad0686a4140d80c3cd4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick users into downloading a password-protected archive, a common tactic to evade gateway scanning. The embedded URLs, such as 'https://cructi.ru/uplcv?utm_term=gta+sa+lite+apk+free+download', likely serve as download locations for the malicious payload or further stages of the attack.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cructi.ru/uplcv?utm_term=gta+sa+lite+apk+free+download
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t01tovpchtkd11s15o1gam9d92/30937421974.pdf
    • https://ceiling.holcom.vn/webroot/img/files/fevuwezuwarobelu.pdf
    • http://www.childofafrica.org/media/userfiles/file/5742870973.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/09kn4ie7t19lajkak9d09ouhq1/rakowatoleloxebimajigawa.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613646d52d086---92658071443.pdf
    • https://stl-log.com/htdocs/cljr/data/files/bilumigesipusugipowewuk.pdf
    • http://eraldocomo.it/userfiles/files/wowobenepanikixevim.pdf
    • https://medbillings.us/lightspeedweb1/file/muxesababup.pdf
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/55292429521.pdf
    • http://seghers.kr/data/editor/file/1411457892613dcef675edc.pdf
    • http://permagnet.com/upload_files/file/21091119065199498597dmkg.pdf
    • http://eapver.com/upload/ckimg/files/202109072348279309.pdf
    • http://aktifimmo.lu/userfiles/files/45006729096.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161367ea589531---varunetirobifepurizo.pdf
    • http://fotografoenricogiampieri.it/userfiles/files/nisuzovunolibowawufar.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f804ad2cfb---55673135703.pdf
    • http://zaiger.ru/img/file/19416747650.pdf
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/rujatus.pdf
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/jibawobaxati.pdf
    • http://www.cpiequipos.com/assets/images/user_files/files/wusituvoroligefav.pdf
    • http://bodybybodyology.com/ckfinder/userfiles/files/94299402719.pdf
    • http://www.gabrielamaciel.net/images/content/file/reburewo.pdf
    • http://ternovykh.ru/content/file/didijemelebofurixeguwe.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141781240035---27872587307.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d151.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD151 16792 bytes
font_01_sfnt_off0000e963.bin
20f171e7d64712e646cb624990f4a397de1d61ab9c855f961dfaa13fb48ac966
pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 20412 bytes
font_02_sfnt_off00011f04.bin
a08438057cdc496cec30469bc1c731f472a7eb77170d2facacf219813ec1ad44
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 10708 bytes