Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d45983e53d8a2a…

MALICIOUS

PDF

98.6 KB Created: 2021-07-08 02:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: be474b832e39ba85d990bd3199fe2607 SHA-1: 9ead71ea2da7ccec8cccdbdbe93ab2a4813a3c18 SHA-256: 56d45983e53d8a2a6d0d2ed9574113712f678fe5eb960591524cc2ce91558ec8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9785

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 http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160903e9e6272a---tarumu.pdf In PDF document text
    • https://aduanaldelvalle.com/userfiles/file/xaworexabejok.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/36346420861.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6219f354df---kadodokesamubaxumo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4bc30b8b0542f990546135c85ada9b6f/sowosijirexebewidinano.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d595fe65d2---zagizoxim.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gikamunesewesi.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d86ccf989---mirixuzexiwexedonewozali.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/71734256312.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098ed828c51c---fewowivetufuwib.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e13e8a577---fexofafidogumixag.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/45683892629.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8a569913d---32070057737.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd941d6bb---siferekedutip.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e7e22f2d---fofoju.pdfIn PDF document text
    • https://vestol.bg/files/file/42714935885.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073db281729b---39922990814.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080317ab45ec---55515209454.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609acdb55e4b4---72438243718.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/29529609291.pdfIn PDF document text
    • http://cpils.com/userfiles/file/sejolotebeseda.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/73933823527.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc07920b5---divemorevurami.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/f9f28km3eg2vc1o4lahbht46i1/97021986227.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/06529b1e76e5505bd92bc65e080bddf0/wuwavapivagutejidiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=meaning+of+ascendancyPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f85d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF85D 18764 bytes
SHA-256: 38cb8b22c60f41647f9de08500c4e229700e4d043a875b82caf73d757d36a2ff
font_00_sfnt_off0000e04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11763 10516 bytes
SHA-256: c78e35e6b185435d53214108775e499878fcaa2cac6a33d5b8317f6117d963e7
font_03_sfnt_off00012f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3E 25012 bytes
SHA-256: b18a68fbf5221bcea1685f7c35a90b45bc63e22d8d3be9e213e3d3c66179e951
font_04_sfnt_off00016ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AD3 4264 bytes
SHA-256: d4acc6296a3f39ad488370c35910b3265ecf9e76e229b581ec7b5420f0612564

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