Malicious PDF — malware analysis report

Static analysis result for SHA-256 8129b6ceb473b6e3…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 21:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1dc44053d6d4b092ce3ca019ecb77424 SHA-1: 72fd367401cb5c1966745e7925981048b1d33f59 SHA-256: 8129b6ceb473b6e35677d8b14a4454ad33a9c8d006fb0ee85fd485a916d43416
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm hosted on compromised WordPress upload storage. The document body is heavily obfuscated, but the presence of numerous URLs, many pointing to PDF files on various domains, suggests an attempt to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fdaf0e455---fizekawamikewove.pdf In PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1770bbdc2---jowiminonobibujuketixov.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdaeae93a5---pufusokifidogemovuzinap.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/69286440668.pdfIn PDF document text
    • http://khocabien.com/uploads/files/66566092073.pdfIn PDF document text
    • http://riversreunion.org/clients/8699/File/ferexolawuvurexejojimuda.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210531_0DBCD8359DAD9DF0.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/b539dcb5078782d260afbf2346798ae4/56006893473.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/gerotefexep.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113c5f86a122---metosomag.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/37734422475.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/mezamemuvodevidolez.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/xenotejimekofulekamirow.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/kawuwifosomazulipopulo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac16547688---93942103383.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/redoremibumofapexu.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/99245922873.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/nabitodevonemedosaxulewor.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/521aa832e4f8d928e3796583d8a765c7/pabeg.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609405944e00f---55889487874.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/46151796469.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/liwiwuxadonokoxosaniko.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b133fb624a---38574637871.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/56751fcfd3f24f6fb9fdcb6edcdd3ffb/96107343828.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a9ed17971fed73d5517bdf52af8a80b0/92060270929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=simplex+fire+alarm+panel+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 18240 bytes
SHA-256: 6cbc3b7ee39872d190317cb3408b699a8c9919ff3ce42dc4ffeb3b630c0130f0
font_01_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 10412 bytes
SHA-256: 353b771cb6d349afdf471fbac7605502e0c8a56b7587b20bb6f266a695be699c
font_02_sfnt_off00012d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1