Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecf12d48cac1d04…

MALICIOUS

PDF

114.0 KB Created: 2021-08-13 10:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ccf0a2a036ab66bbced0372ff50ab701 SHA-1: 58c744522deec09968eaab5ffdf27f0ac550ecd1 SHA-256: 4ecf12d48cac1d042cb34feae889b38498027ecbe9802da66f4cb3214ab98d51
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a 'LOLBin token sequence' in the document text further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08ddbc1171---sipozugemitup.pdf In PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5b8b4311ba3e7cfb92905f25772979fd/xevojawozekizonopodevoba.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/teganava.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c2ec2d9253---21497535477.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/59358467156.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/65306054415.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083099f8fd0b---37572346867.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/nokonomatulufodezesiwig.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608929f864b0c---86115888145.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd817f333e2---dutopaved.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/a1upa99jr19opcocfi5590is0h/pixiwezamewuwukuluwizolet.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/sumuvez.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110a8a63021b---lisisugofulosepedafinet.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ade589e749ee301eab1a7ef0ecbbb67d/3298576721.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7c20f2a1c---perosebisusi.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b026b12ad---81314824928.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xotadupodobovatuxugif.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/82093911514.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/mosikawejilesi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/3cnda1gq719jg84dvcmddgakbg/nizojumez.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16088f184f0179---kokerasanomojunukemov.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210729234859064.pdfIn macro / runtime command snippet
    • https://www.meditech.cz/ckfinder/userfiles/files/lixosekawidu.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=english+vocabulary+with+sindhi+meaningPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014697.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14697 38964 bytes
SHA-256: 6529cc8c63e17eb02a7c03e35f3454c0c2b7a36197959581b6091df63354cc24
font_00_sfnt_off00012473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12473 13816 bytes
SHA-256: 50a1d976e607951a94aa6727ee02f47d9b7e4de9befe4df42ce315d244b0c5c3
font_02_sfnt_off0001872b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1872B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F42 11308 bytes
SHA-256: dfd00c34d0e6f0ee90d0cfbd363381907a572991a08a27ef6933af74136b91d6

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