Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea638560af04bbb…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 04:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f17489478664552edc5c2182813349f4 SHA-1: 1bff21af272a3c0a6bdcf6ac53c8ff9f6d48bed7 SHA-256: 8ea638560af04bbb03cbb76b3a39bb62aacdcd07bb9e815860eb54e6625db2c4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious PDFs. ClamAV and ML classifiers strongly indicate malicious content, specifically a phishing trojan. The document body is heavily obfuscated and unreadable, but the heuristic findings and URLs are sufficient to infer a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3d50e5188---jivegefalilow.pdf In PDF document text
    • http://candybeauty.vn/upload/files/75756837186.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608690e16c165---vajudalirerapodawuwef.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/webedadoposajokezidum.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/b6nfpsguc7f45tl5s1g8h1g44v/82131592231.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/12102579900.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/xodujediwafigudawesupaj.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a24fa7247---87651206357.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210722225114_ut2xcg.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/sutuwipetozalubuzikuv.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/34452202942.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/3930935157.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/61215866133.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/5cdgmacaaf2jvt6i10hlesv7ut/jutujis.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/32790102883.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/mpqkcm04ogoi1isi04uhf3r56r/nofizesisimufurusutebov.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/wafazimipokeletezub.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/47355422946.pdfIn PDF document text
    • https://badoza.net/userfiles/file/86270533199.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/juwud.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/vunizizeliwomexepixasin.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/derugilapowulexi.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/3kg4ts11q1u9uv25brhtudo655/2198852367.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/235a50a5b42e69cb099bd4d872667767/31617194098.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210714_C8B7C92AA75F8E48.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=came+to+the+forePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 10100 bytes
SHA-256: b91c55b4fb2dfeb2a720b623b1a835b0eeb9ebb611e6045b4cd2dde73d81d6b5
font_02_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 16316 bytes
SHA-256: 7017b6b7a6632f7f8fef21e12af68413f5d94260f0690f8b2f602898faff6fe2
font_03_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 20024 bytes
SHA-256: 832371ef11afaffac1fa20b2a69c7fb1dd4d68dc5b332c4bbccb8f0e747cabb8

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