Malicious PDF — malware analysis report

Static analysis result for SHA-256 551189622eb21c7f…

MALICIOUS

PDF

99.1 KB Created: 2021-09-01 04:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dbbe79461564c5c6313cbe0c6e885fed SHA-1: 2863956c644271b7fe584a187df73eda35715594 SHA-256: 551189622eb21c7f449d5cce97a6631dd719a845bb4a5cb68a6ce4225a0d554e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://huntic.ru/uplcv?utm_term=when+to+write+to+whom+it+may+concern PDF link annotation
    • https://haltia.mx/sii/ckfinder/userfiles/files/54050045004.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac942bccac---lexeju.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/8mh048eq3ugdei8dpgvipiqtrl/92554031570.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608505ab45e83---tirodugowamavofi.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b403a5a2ea9---geviwufigikonojofad.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798b8044449---6386029401.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/49780603130.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/pejojirofisubitefalobu.pdfIn PDF document text
    • http://tylerdaynursery.org/clients/8/8e/8ed7c4ff1d995b028c1180c1bccb3f4a/File/3222890167.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/pewoga.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/bopatanoz.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/vagefamel.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c5418347b---tufazugijib.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/69545667254.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/750a626b06760f16b30f750811f3efc9/12195589356.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-8-24/20210824233125254108.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/72306729199.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/kijapabunosojusad.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/22dfbaa5a098aab9c9b9e620197d4160/dawaribire.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f4470292---35266834281.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4cbfda8b1f---jutudemasinil.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/ruzexowojozuvidoparuzo.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/91b83f119e5766bbae63e272e7ed7dcc/bugumogeruxavugibu.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/fuwivalabevef.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_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13250 19936 bytes
SHA-256: f3b6d8023d30d41dab0250dfc6f0809f0d868f3cace38923ef6a0a4d2f5eea6a
font_02_sfnt_off0001664f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1664F 10472 bytes
SHA-256: 90fd37d532f3a1f11f02b553243a4c40a837808a70d8c5b90e14aeebfedfb5f0

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