Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0d1d8f6035ad36…

MALICIOUS

PDF

146.8 KB Created: 2021-07-01 15:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b04ead55e3a412f9db6cdd4917c5159 SHA-1: f48a76416971a63b19a489f9fc7d4353ca80dfe4 SHA-256: 8c0d1d8f6035ad363ecef377f74f13102dd98a5d073afd3f7090072426ce6a6e
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Installation

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to potentially compromised WordPress sites, suggesting it is part of a link farm designed to host malicious content. The document also contains instructions to disable security software and mentions a password-protected archive, indicating a lure to download a second-stage payload. The presence of these elements strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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 http://doktor-okonski.pl/uploadimg/file/8981515948.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/0f74393a959ab2efb5766f7b8f7b2e06/wubimi.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160afad989c750---dololuzigogewu.pdf
    • https://hondaotohaiphong.vn/upload/files/88712305541.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/kqahddnd2hr665gkh50rbu07d5/4806097558.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a8645dcbc---45901947765.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa98eb511e0---71516564629.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/df1f536e1a50b524a034367befe61e96/bodabelukunoferiw.pdf
    • https://tecnibat.net/uploads/archivos/wazefivuna.pdf
    • https://retake.dk/ckfinder/userfiles/files/relaruz.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c89a0c8859f8e85582f1ad6d1873ffcb/netafogosajogegatisajaxu.pdf
    • http://rsst77.ru/upload/files/pebolaresufimebawa.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/4epllp4u133n94vo1j1o00sfqi/paxewawekalujuwaxexirexi.pdf
    • https://acronimocostanzo.com/userfiles/file/63832109582.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079772c318c2---38565192959.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6c0888c7df5dfe16407986cc472a0eda/watenozibofazefebi.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba8996c70---82597077711.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0bd7528b0---rudozapuwapiminagafevog.pdf
    • http://polkovnik.su/upload/file/govuwor.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609699b813cc8---46059550190.pdf
    • http://botosani.ro/img/uploads/file/xupeva.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/dqusk3gn35d9i65vl0t1hcuoq5/peforukosomarozegeruno.pdf
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/mokevufu.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d892c96c6d---2628143806.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dragon+age+inquisition+goty+torrent
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bdf7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDF7 16792 bytes
font_01_sfnt_off0001d608.bin
c177f9fba7578a3584bf304a8a4d37f3396c9ec348343f120f2997e18255a671		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D608 18088 bytes
font_02_sfnt_off0001f24d.bin
35076a301631c720d5988c6503af6b602af1fd0ee0689e09eb687f8703763b24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F24D 18588 bytes
font_03_sfnt_off0002230f.bin
477ff2dd3e08a07961a14c214fdaf318817a344184ae33cb88585a793b37e14e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2230F 10596 bytes

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