Malicious PDF — malware analysis report

Static analysis result for SHA-256 14bbbd8fe7f4a4d5…

MALICIOUS

PDF

85.4 KB Created: 2021-09-05 08:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78cbd42f7402bd1ede6d0114a54b6b9b SHA-1: 08e6b6f3b296080226212c6389cdf82dfca94c70 SHA-256: 14bbbd8fe7f4a4d515a29de664d95e88a9b323d6a5dd5dec52a54d95aa9d10c0
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous URLs pointing to external sites. Several of these URLs are hosted on compromised WordPress sites or appear to be on disposable domains, indicating a likely attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=palmone+treo+600+manual PDF link annotation
    • https://impactmediaresources.com/userfiles/file/86410898783.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/61978373764.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/popago.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/fedelufubulorul.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/baganekanofovavikizoxib.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/31275674444.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe9b1e4a1d---85474249517.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff39c2c227---56343978934.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/tutevisusivotukexetiru.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210612_B962F399EAAFAAEE.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fd717c752---fugigavoju.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/98109768242.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f3f081c61---zemetazaxogosusifeneza.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/2168a8accd1012cc400f6a41a2d59e20/tabawolulutuw.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/12481402187.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/11807172324.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/gojanegad.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/rerujagewotonisizokigasoj.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a9a826f9d---taviso.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/bizuvafin.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8010fcfc96f78c4ad59393ce2a89cc33/vejawapitesug.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/91223077038.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/44842332585.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/311n185caclc31e7l5ajecmdc1/93755063012.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_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 10400 bytes
SHA-256: 01324f8db1da13c80b5ea82aa1fdc00c9600e3861e3a7a8d73c1eb6853e81a9a
font_01_sfnt_off000100ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11900 18408 bytes
SHA-256: 45cc053008a23c2531cc6ff15c236cfdd1fc38bdc54ca46cbc979c7c5801eb92

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