Malicious PDF — malware analysis report

Static analysis result for SHA-256 6525fea67fafce7e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-08 10:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c99512608898b45114d6393fc159f2d2 SHA-1: 475c3f21b6e3bee75c38ef1cb014edc0970b1bd4 SHA-256: 6525fea67fafce7e9ddf39d16df456d9af3ebb9a8edb267249f34d3dbca407f4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://akamercedes.com/images/uploads/files/dogasekitepubiwuwoza.pdf In PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096121081ba3---55141123885.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/soxeturapemedazukaxonak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78d3f09f38---pusuwoluverupelomu.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/bigag.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/0vaegrieu2qpd67826glqdknlr/48992953508.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/42303443089.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f1dd8dca599d29f90897c78694b99fe/nokizutupobugumi.pdfIn PDF document text
    • http://maihome.hu/admin1/file/46089896006.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a87824b3c2---niriwejimanivogezotikime.pdfIn PDF document text
    • http://goldmustang.ru/files/files/kegobanedosadi.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea29519fb---kamuzeduxezuzijiwu.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/6691513274.pdfIn PDF document text
    • https://isleo.com/i_photos/file/75646669387.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/55626dc76d215d4934053a1881219420/vavakazuje.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e3d07d01f886ee33d5e2a516954f87ee/gamekugagajipuzoxa.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/mezilinexijos.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609d12e193c04---bedofozonemukoxu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717579e25ba---17266090006.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/53710141527.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/73031126399.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/nalofemirazod.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/80990414692.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/ramonulegi.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/degidukakiwewoxasokepefuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=manual+de+instrucciones+maquina+de+coser+singer+247PDF 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_off0000ca7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7E 11200 bytes
SHA-256: de54a2f6924e2b7e6b363766d32e925e86ae6fd66dfb9617a315f7d2bcaed9f8
font_01_sfnt_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 17736 bytes
SHA-256: 565091867f3de81ea10bcc213db31107db065a09785a82cbe1c7e87f4e45f48e
font_02_sfnt_off000110c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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