Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc375121d3bf1e0b…

MALICIOUS

PDF

88.1 KB Created: 2021-06-27 23:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 69134cf2321267250b374c96731f4f3f SHA-1: 304586edc5b0fae878f545eb71731a78735fea3a SHA-256: bc375121d3bf1e0b86371c7d03b757949c7d18e778b2ce5efaae94559e564f70
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to external PDFs hosted on potentially compromised CMS upload directories. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose. The numerous external links, many hosted on disposable domains or compromised sites, indicate a likely distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://seerupit.dk/assens/file/nifebuwevaxoj.pdf In PDF document text
    • http://stjconsulting.it/userfiles/files/29010166575.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c0a8sfmb5hbeub9spr6m448s1c/ligakagifibo.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077e716b558d---31460151323.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/617ec9d682cbd568f79ae6531205c18a/51945326537.pdfIn PDF document text
    • https://bachson.net/upload/file/tukepamasegopebu.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/61205267499.pdfIn PDF document text
    • https://agatanorek.com/files/file/lazerizir.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/1077193754.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b144407e7---54686644835.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/21893227078.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081319ebc40c---sigabumaxotabuxikabolav.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29a814ce18---83992592011.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/6i85qia16hk1a9ibf5kot6002c/xobuk.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d27172c4f65---lovesozijitakifufetodaw.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c865986fc3a---xepexu.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/99996076641.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc2b70e46---42326827951.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/gadikukovazosaw.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ab4ab3a8b5cd1194b16adad7f34b935a/83026366658.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e85f5bddf8d757aaae2598a606cfbcf3/gikivebimorazamem.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/rp4j0tqig1mhf5sribd0medp25/wuwebunat.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160866b4366d38---vujoxuvepofonudovun.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/xetifujijaxalog.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/disamoditazigu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a085a5d77de---sexupuxebevukeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=analytical+thinking+skills+examplesPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609415a3bcebb---90467831412.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_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 17096 bytes
SHA-256: 3719e319798196397aaeb4fcb7c74f27dc2a18c5b26d2d76ec372ce0681cfdb9
font_01_sfnt_off000121a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A2 10892 bytes
SHA-256: 36ade15320c9b7e7a3b60ca8e2556e47a801aaa8f746451ddff8a3a23edda64f
font_02_sfnt_off00013ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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