Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1ccdf19945ee66…

MALICIOUS

PDF

88.5 KB Created: 2021-07-08 06:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 04eb35c14f73fa03664f43371cf57f05 SHA-1: 05add46817417b9fcc25794dbbf99e63be5e7a26 SHA-256: 8b1ccdf19945ee66fdc19c6e7e4666d4671078ac7b61f6912f5ae59bb196eb70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that likely lead to further malicious content or downloads. The presence of multiple compromised CMS upload links suggests an attempt to leverage legitimate but compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=drawing+of+office+building PDF link annotation
    • http://domholidays.com/userfiles/file/62604057187.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/lasoxevoj.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e30ee3250---20117918470.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e5e93f176---vegezulipamuvi.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607254c26c0ad---61133972138.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9695c9aa87---84724764757.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69eaa7bd8a---50504815247.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/nozetafefudakake.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/92269509543.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a8ea88a7---kabelujufuvadosa.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/wozojopurusukixururek.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/20f774e1e7b5d66b0bb5a449bf55fbd1/65698416417.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/57051081815.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e0f1795a4---sateduzajijubapusobenufag.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e1e65f7da---fepazepatijexuluzatizu.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/kozawufotowotiju.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9086850641---8258305268.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/42810522304.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/gufavofubanulogonosi.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/gebezakakozozutusarejuw.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/6081093114.pdfIn PDF document text
    • http://erex.hu/upload/file/37187516843.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dd954f2265fceff4a1caa5967bf653d4/45899120975.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a115efb9ca1---zarupa.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/65484721492.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_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 17440 bytes
SHA-256: 3e10cf7812992fa7e9545606ef4736609ae2f2e6dd6a8ce7bbcdcca88297bfe7
font_01_sfnt_off0001244a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C61 10712 bytes
SHA-256: 194ecd3294f89787146a244716f12abc4253fbff4edc700ee8958d72b3fed532

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