Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c358d48eb3c84a4…

MALICIOUS

PDF

78.4 KB Created: 2021-09-20 07:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 17b6b9a313e258e3a82518ca215fb996 SHA-1: 6ed2589bfb72ff9d72d1c4079f72459d0c914c92 SHA-256: 5c358d48eb3c84a43e6e3aac8fde581bf1b918afc597cd23137e0dbb34051045
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=constant+rule+derivatives+examples PDF link annotation
    • http://hangtatmj.com/userfiles/54199051359.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/10781457768.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/sagivagij.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a848039b59---fowademejobi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613513adb8bad---nuvarisexelotumubegizev.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/gitatafizepe.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/68571462885.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/zitekaxorivilujovon.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109022304454217.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16145b60bf3e7f---xudom.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/5759352541.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ca3c20f3f---movelotesaxot.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff4e87bf58---mawulajotazexojelabulag.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/70191606322.pdfIn PDF document text
    • http://cartopack.be/Images/file/95037458173.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/49558075794.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/87966574356.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/ludidaxuwekixukofatada.pdfIn PDF document text
    • https://techlan.pl/files/file/kefinim.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/5049227824.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365e1f6d664---97341156083.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/71628164581.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/mejivigemasu.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/85774760259.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/suvukagom.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_off0000cf32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF32 10852 bytes
SHA-256: 48aab5b9a672c22277f1180f74dd8511235a40d1ece8ff7254700156edbc13c3
font_01_sfnt_off0000e84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 16960 bytes
SHA-256: dab37485a5c049f0560b7448add106d4632d7660ef88c897c989b22ad37175eb

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