Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04e7be48612df69…

MALICIOUS

PDF

70.5 KB Created: 2021-09-20 19:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ce85b9f9a1958498c94030928355492 SHA-1: 5f0095332a82fbee195158c449aad11b0a4ef8be SHA-256: c04e7be48612df6978c7650396e19fbd2fc7fe9c2176c0c722480e98b78b7118
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and other disposable hosting domains. The embedded URLs suggest a phishing or malware distribution campaign, leveraging a network of links to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=connect+android+to+pc+bluetooth PDF link annotation
    • https://mongolia-volkslift.com/uploads/files/1091401358.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/69755758541.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140946a5f262---98883680513.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140f09c1db66---pisabevonotom.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/90287871877.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/76130933783.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/lafapowomutasowil.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/59917529830.pdfIn PDF document text
    • http://levotst.com/uploads/files/57490983804.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/rugugujopobiwirezi.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/rokatevifezir.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/53561600935.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/litoruvinowejafubetito.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161410805c11ef---fopofoxenazopino.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/6263078748.pdfIn PDF document text
    • https://airbays.com/userfiles/file/78868324557.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/55134226844.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/jemowapov.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/kapolasik.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/19446028303.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/mikojotaxutufeperitamonam.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131f175eee39---95472161871.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/musenugizigujib.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/fabusizizo.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/repugilos.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_off0000b3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCF 10712 bytes
SHA-256: 35cd67bc9d6226502b3195a1f304a667a0df4a8d0fe834f20a5904a950c16b97
font_02_sfnt_off0000e40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40E 15888 bytes
SHA-256: be03807fb121b4bf8fb72a80ba91322c42d55c771125d0cb424c18d573110eae

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