Malicious PDF — malware analysis report

Static analysis result for SHA-256 f358f348255ef6e7…

MALICIOUS

PDF

97.5 KB Created: 2021-08-29 12:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 760e4088b1f971f6f259c52ff4309955 SHA-1: d287c96737b0385c2d14df0cd664610d5e48ef79 SHA-256: f358f348255ef6e7a8cf2af1c3b687c61a25d5f9e2b44ebc226ecc35d522ae3a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pomocnaukowa.net/Upload/file/virilapudebez.pdf In PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/ecbc72fedd445f07800ac27c2bcdcc91/risuvebegij.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/29002357058.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/zorokaxomige.pdfIn PDF document text
    • http://trivio.it/userfiles/files/15293346956.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/50270755025.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1610add03536d4---12189895453.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/0cfc23e73fe03701aa7ba84a36ba10b7/gifugipelulaxude.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-12/20210512080851377420.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/badidipunoguruxajevalegeg.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4bc9cc1885bfc6c1f8c65e4d8ff398d2/74903168990.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/11335615623.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda06f4abf9---kukigajenebumuzeku.pdfIn PDF document text
    • https://clubon.top/uploads/files/tegafoxumawewamesesibeg.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/53897097719.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a60a2488d4d---ladirate.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/refesediw.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/boxowalozupu.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/14010066473.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/xemunezosipixuv.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/tm04ac4mn3c8p1m52lcoq2q1v4/wowanarudir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+write+objectives+in+a+research+paperPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1bb3f4d8196697689dd6a06ac4d43160/44485647425.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_off000116db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 18400 bytes
SHA-256: bc50ea0b3440a108068aace122499a45995f47df8a0dcb69a882bceeb0653a08
font_01_sfnt_off0001463c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E53 10840 bytes
SHA-256: 93e1b1581b1333ea3993adc41d5f58e6868f4a6a46df889551a2a3a6d72cc14f

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