Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd77494c203b5732…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 05:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f253e8f4f9e62ffad80cef71db3e9e3b SHA-1: 8972c6d9115ada551aaa7354cf2bcedfae21f23d SHA-256: dd77494c203b573247141ce132baeac0dfdf7edfc4643ff1aadbfb95ae7316db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs further supports this, as they likely host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2a5401b0d146fe6d06dfcb56d0f896e3/keluduredepegiboluki.pdf In PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107a9ce9563e---97274401838.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/47994615272.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/fuwopiseri.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/funigexigiwiteb.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/9b41c988ccb0ad139bef26bbea7cd115/fovurorebo.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/b5340575dc6989d42ec50464232c509b/58350343465.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/kawujusenobelu.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/jeremawonimenegapakenes.pdfIn PDF document text
    • https://projetovm.com/uploads/files/60550998235.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/wetijatavopiwepixul.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/85345301582.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/39757355867.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/f0iu236ktjeo1fgi6v2qrnmhsf/juwosisuve.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210728_0B6F70C132C136A1.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/59296463661.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/is6ud2taodg97kkkdtn4h7lbee/25223688541.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/gp4dan7i2odhcrh5pd4bfafpp5/77501832101.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/64081060798.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609d36f100a5c---jinuzusutodugorefubemol.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9b0939008---13793930539.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/22619722148.pdfIn PDF document text
    • https://noddy.nu/images/file/tafujanivosifa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132908a659b2---44576076847.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/57438236737.pdfIn PDF document text
    • http://fkhd.cz/data/img/kinazudenurafukavetewodef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=lma+loan+agreement+pdfPDF 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_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 10536 bytes
SHA-256: 8c8dc41b46088791753a65706dc98db4849b7136ed6b50306d42ef6e6eddd5d2
font_02_sfnt_off00010ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA6 17504 bytes
SHA-256: e1b2e613e831f5ca073d7f64e4b30802c40d0d8aeab7d502eb47f680f1f9f0ab

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