Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8b6fadb3b0b769…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 19:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2cd83b067d05da8595c6385443838447 SHA-1: 3abf264a7ca502f101cdf913278bc9fce0660543 SHA-256: dc8b6fadb3b0b769980b03f5d5fb55fbc123d33da445e31fa9b2019c9ede828d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to various compromised or disposable hosting sites, likely to facilitate phishing or malware downloads. The presence of multiple unknown URLs and the nature of the heuristics strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://samurairamenbar.com/uploads/files/43445596701.pdf In PDF document text
    • http://bulmarconsult.com/files/11376492606.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/7126168938.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f06228ad5e---jofuseronetixivami.pdfIn PDF document text
    • http://krupongs.com/images/file/gavomomatuveguba.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/663267379614018b988c06.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/nudiverorevo.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/59100720237.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/bunuzomukidafo.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d0d43c7977e01b91692d376a95ac96d5/gogiko.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f542f2fea4---33110143074.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/7a31eebb1f35f2a1d7fc8bef656f1263/jigawutakiterit.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/10243397775.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/jotamafeleledonabolodo.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/wuboxowa.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/kidin.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/xamiwazegesozalage.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f131442b3a36e5a479900aa950a266bf/18053467972.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6f65b6a76---venisavixe.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8jopgt8ujso3o3s76bqrguu1d7/pozizegumax.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/89491748789.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/nibabaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=apk+download+among+us+hackPDF 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://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_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 18176 bytes
SHA-256: 8ad3fb9e7a5f630587bbd9f100dac66a89916b78e3b1b68add800a5268937f7a
font_01_sfnt_off000105a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 10796 bytes
SHA-256: 975e0abaab7aab0f79ed23a8f27aced2964721023682aa3f8038c4bff32b17de