Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05e5d51c3c33695…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 05:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd6b1421ea187355bfccdb81df76810f SHA-1: f1a84c6bf66341446210637becfe05cd0538f693 SHA-256: a05e5d51c3c336952baf7e0ea4c2325c6ae995f71fb7c4530b2696fd5b97aa0d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=what+do+you+mean+by+hydrogen+spectrum PDF link annotation
    • http://positiveforce.in/uploads/files/budebegopexavume.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/58549537553.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a76fdb1f28---54766545074.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/xejadefuba.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/10399971101.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091dabbd9192---96796949130.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/m0t9rbht97r0beeadusuvm5d4j/41101389602.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/33715326447.pdfIn PDF document text
    • https://clove7.com/userfiles/file/weruvexi.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/mawuxunupidotesekigobemib.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/clr8dfgak3rvog20r4t957c1d7/tuvatipoburixejumusabax.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/sitajogubu.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/8872827514.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/xesarunutedemifiveg.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/rinebisupe.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078698558750---37659013145.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098b543ad88a---mufogoxolif.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/54142750947.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/9ce0d2e0f86f23d22f6a2091978b941b/wumusegufesemop.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8e110494900601d47d43c9063896fb44/24452640020.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/98192831667.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c869425c0d3---kugubipotapa.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_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 11168 bytes
SHA-256: 41b073c02e0c613fcec3cd81ab3c668c94f9af3f57398053dbdb582135e88b52
font_01_sfnt_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 16860 bytes
SHA-256: 9c2c1b72eb0c491209c99c62fe79ddecdceb65d4568bfeba802d8bcc6dd6d8a1
font_02_sfnt_off00011e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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